Home / Landmarks 325 WEST 93RD STREET ARCHITECT . Union Street Studio PROJECT SIZE . PROJECT COST . SCOPE . engineering design and approval services for all mechanical, plumbing and electrical systems Go Go Designed by the prolific Upper West Side architect George F. Pelham for the developer Joseph H. Davis, this building was constructed in 1906 as a small multiple dwelling (flats) and once known as the Albea. Located on the north side of West 93rd Street ninety-eight feet east of Riverside Drive, this six-story building faced in red brick with ironspot headers and stone trim is seventy-five feet wide and dumbbell-shaped in plan. The facade is capped by a modillioned metal cornice. An original wrought-iron fire escape is located at the center of the facade. The owners retained Altera Engineering in their bid to renovate and reposition the building as an upmarket rental property steps away from the Riverside park. Altera Engineering's scope included gut renovation of all vacant apartment units and building systems upgrade. A new high efficiency condensing boiler plant was designed to replace an outdated (once coal-fired) steam system. To fully take advantage of the condensing boiler efficiencies, all new hydronic radiators were selected around low water temperatures. Variable speed pumps were selected for low flow, wide delta-t of the water to minimize motor horse power. Domestic water was upgraded with indirect water storage tanks fed by boilers via plate and frame heat exchangers. Altera Engineering team had to work around existing occupied apartments to minimize disruption to tenants. Altera Engineering provided MEP engineering design and approval services for all mechanical, plumbing and electrical systems.

Home / Landmarks 428 GREENWICH STREET, MANHATTAN ARCHITECT . PROJECT SIZE . About 5,500 SF PROJECT COST . $2.5 million SCOPE . Full MEP/FP design Go Go Full gut renovation of a landmarked townhouse located in the historic Tribeca North District. This 5-story, nineteen-foot-wide store and loft building was designed in 1883 by Thomas R. Jackson, an architect who worked extensively in the Tribeca area, for soap manufacturer James Pyle. The utilitarian Romanesque Revival design features red brick façade with rock-faced granite elements, corbelled brick cornice and cast-iron piers. Presently the building houses a Tokyo-style “Edo-mae” Sushi restaurant, which was awarded a single Michelin star in 2014. The upper floors of the building are being converted to a single family residence. Altera Engineering carried upgrades to power, water, sewer utility connections. Altera Engineering worked closely with architects to seal and insulate the original walls in order to minimize the occupants’ dependence on HVAC for comfort. Our engineers worked carefully integrated central heating and cooling systems above the ceilings and behind walls. The building is cooled and heated by a variable-refrigerant-volume system without the use of fossil fuels.

Home / Landmarks THE COLONY CLUB ARCHITECT . Li · Saltzman Architects, PC PROJECT SIZE . 80,000 SF PROJECT COST . SCOPE . Design, approvals and construction administration of mechanical, plumbing, sprinkler, electrical and fire alarm systems. Go Go The Colony Club is a women-only private social club in New York City. Founded in 1903 by Florence Jaffray Harriman, wife of J. Borden Harriman, as the first social club established in New York City by and for women, it was modeled on similar gentlemen's clubs. Today, men are admitted as guests. The Club presently has approximately 2,500 members who have access to discussions, concerts, and wellness and athletic programs. The Clubhouse is renowned for its classical proportions, sophisticated detailing, and graceful interiors. The building is approximately 80,000 square feet and consists of seven stories, 25 guest bedrooms, three dining rooms, two ballrooms, a lounge, a squash court, an indoor pool, a fitness facility and three personal spa service rooms. Annual gross revenues are more than $10 million.

Home / Residential 428 GREENWICH STREET, MANHATTAN ARCHITECT . Thomas R. Jackson PROJECT SIZE . About 5,500 SF PROJECT COST . $2.5 million SCOPE . Full MEP/FP design Go 428 GREENWICH STREET, MANHATTAN Full gut renovation of a landmarked townhouse located in the historic Tribeca North District. This 5-story, nineteen-foot-wide store and loft building was designed in 1883 by Thomas R. Jackson, an architect who worked extensively in the Tribeca area, for soap manufacturer James Pyle. The utilitarian Romanesque Revival design features red brick façade with rock-faced granite elements, corbelled brick cornice and cast-iron piers. Presently the building houses a Tokyo-style “Edo-mae” Sushi restaurant, which was awarded a single Michelin star in 2014. The upper floors of the building are being converted to a single family residence. Altera Engineering carried upgrades to power, water, sewer utility connections. Altera Engineering worked closely with architects to seal and insulate the original walls in order to minimize the occupants’ dependence on HVAC for comfort. Our engineers worked carefully integrated central heating and cooling systems above the ceilings and behind walls. The building is cooled and heated by a variable-refrigerant-volume system without the use of fossil fuels.

Home / Residential 848 CARROLL STREET, BROOKLYN ARCHITECT . TRIARCH PROJECT SIZE . $ 2.5 million PROJECT COST . $ 170,000,000 SCOPE . Full MEP/FP design Go 848 CARROLL STREET, BROOKLYN Full gut renovation and rear addition to a landmarked townhouse located in Brooklyn’s Park Slope Historic District. The history and development of the Park Slope Historic District is closely related to that of Prospect Park. The area encompassed by the park and the Historic District was the scene of a major battle in the revolutionary war between the Continental Army under George Washington and the British Army in August of 1776. At that time and until the 1850’s this area remained essentially rural, consisting largely of farmland with rolling hills to the east. In sum, the completion of Prospect Park and construction of the Brooklyn Bridge in 1883 were the two major factors in the development of the area. Carroll Street- named after Charles Carroll, a signer of the Declaration of Independence- is one of the most serene and charming streets in the District. 848 Carroll is a neoclassical four-story red brick with limestone trim, was designed by William B. Greenman and completed in 1905 and described in the AIA Guide to New York City as “a narrow bay-windowed neo-classical exile from the Upper East Side” Altera Engineering worked closely with the architect and owners to seamlessly integrate all new building infrastructure into the existing shell. Altera Engineering consulted the owner on high performance building strategies, such as passive heating and cooling, insulation and envelope air-tightness, highly efficient domestic water heating and continuous ventilation with energy recovery. With the exception of domestic water heating, the building does not use natural gas or any other fuel for heating, and is cooled and heated with a variable-refrigerant flow system.

Home / Landmarks 848 CARROLL STREET, BROOKLYN ARCHITECT . TRIARCH PROJECT SIZE . $ 2.5 million PROJECT COST . $ 170,000,000 SCOPE . Full MEP/FP design Go Go Full gut renovation and rear addition to a landmarked townhouse located in Brooklyn’s Park Slope Historic District. The history and development of the Park Slope Historic District is closely related to that of Prospect Park. The area encompassed by the park and the Historic District was the scene of a major battle in the revolutionary war between the Continental Army under George Washington and the British Army in August of 1776. At that time and until the 1850’s this area remained essentially rural, consisting largely of farmland with rolling hills to the east. In sum, the completion of Prospect Park and construction of the Brooklyn Bridge in 1883 were the two major factors in the development of the area. Carroll Street- named after Charles Carroll, a signer of the Declaration of Independence- is one of the most serene and charming streets in the District. 848 Carroll is a neoclassical four-story red brick with limestone trim, was designed by William B. Greenman and completed in 1905 and described in the AIA Guide to New York City as “a narrow bay-windowed neo-classical exile from the Upper East Side” Altera Engineering worked closely with the architect and owners to seamlessly integrate all new building infrastructure into the existing shell. Altera Engineering consulted the owner on high performance building strategies, such as passive heating and cooling, insulation and envelope air-tightness, highly efficient domestic water heating and continuous ventilation with energy recovery. With the exception of domestic water heating, the building does not use natural gas or any other fuel for heating, and is cooled and heated with a variable-refrigerant flow system.

554 Prospect Place is located in the Crown Heights neighborhood of Brooklyn, near the border with Prospect Heights. The building was originally Temple Isaac, a synagogue constructed in 1922, designed by architect Martyn N. Weinstein in a Moorish-inspired style with Art Deco elements. It featured soaring arches, geometric stained glass, and diamond-patterned brickwork. In 1972, it was sold and became the Faith Chapel Baptist Church, serving as a church until its closure in 2016. Redevelopment: After 2016, the property was acquired for conversion into a residential building. Permits filed in 2018 outline plans for a seven-story high-end residential structure. The project preserves the existing exterior walls, including the distinctive diamond brick pattern, while gutting the interior and adding new floors inside and above the original structure. Building Specifications: The redeveloped building stands 70 feet tall and spans 34,340 square feet, with 22,720 square feet dedicated to residential use. It includes 22 apartments averaging 1,030 square feet each, suggesting condominiums. Key features include: -A new sub-cellar for storage, services, and amenities. -A third-floor outdoor garden/terrace (at the original roof level). -Upper floors that cantilever outward, creating a modern “floating” effect above the historical base. -12 parking spaces on-site. -Private terraces for each unit. Structural Design: The redevelopment considered two structural systems: cast-in-place concrete or composite concrete on metal deck floors with a steel frame. The project was modeled and coordinated using Revit software. Developer and Engineers: Stephan Tchorbajian of Hye Rise Consulting is behind the development, with Madsen Consulting Engineering handling the structural design. Location: Situated between Classon and Franklin Avenues, it’s one block from the Park Place subway station (S train) and six blocks from the Brooklyn Museum. The area blends historical charm with modern growth, near cultural hubs like Prospect Park and the vibrant Vanderbilt Avenue scene. Home / Multifamily 554 PROSPECT PLACE ARCHITECT . PROJECT SIZE . 22,720 SF PROJECT COST . SCOPE . Design, approvals and construction administration of mechanical, plumbing, sprinkler, electrical and fire alarm systems. Go Go 554 Prospect Place is located in the Crown Heights neighborhood of Brooklyn, near the border with Prospect Heights. The building was originally Temple Isaac, a synagogue constructed in 1922, designed by architect Martyn N. Weinstein in a Moorish-inspired style with Art Deco elements. It featured soaring arches, geometric stained glass, and diamond-patterned brickwork. In 1972, it was sold and became the Faith Chapel Baptist Church, serving as a church until its closure in 2016. Redevelopment: After 2016, the property was acquired for conversion into a residential building. Permits filed in 2018 outline plans for a seven-story high-end residential structure. The project preserves the existing exterior walls, including the distinctive diamond brick pattern, while gutting the interior and adding new floors inside and above the original structure. Building Specifications: The redeveloped building stands 70 feet tall and spans 34,340 square feet, with 22,720 square feet dedicated to residential use. It includes 22 apartments averaging 1,030 square feet each, suggesting condominiums. Key features include: -A new sub-cellar for storage, services, and amenities. -A third-floor outdoor garden/terrace (at the original roof level). -Upper floors that cantilever outward, creating a modern “floating” effect above the historical base. -12 parking spaces on-site. -Private terraces for each unit. Structural Design: The redevelopment considered two structural systems: cast-in-place concrete or composite concrete on metal deck floors with a steel frame. The project was modeled and coordinated using Revit software. Developer and Engineers: Stephan Tchorbajian of Hye Rise Consulting is behind the development, with Madsen Consulting Engineering handling the structural design. Location: Situated between Classon and Franklin Avenues, it’s one block from the Park Place subway station (S train) and six blocks from the Brooklyn Museum. The area blends historical charm with modern growth, near cultural hubs like Prospect Park and the vibrant Vanderbilt Avenue scene.

One Dromore Apartments is a newly constructed 4-story residential building with 45 affordable rental units, ready for occupancy approximately August 2024. The affordable rental units are available by lottery to households between 40%- 80% of Westchester County’s Area Median Income. One Dromore Apartments will feature one- and two-bedroom apartments, including 5 units adapted for mobility impairments and 2 units adapted for hearing/vision impairments. Building amenities include all electric, passive house certified building, community room with kitchen, laundry room, fitness center, lounge/library, EV charging stations, free WiFi. Walking distance to Central Avenue shopping and public transport. One Dromore Road, Scarsdale, New York is surrounded by small businesses, shopping, and restaurants within walking distance to Central Avenue. Located approximately 7 miles to the border of New York City (in The Bronx), 11 miles from the northern tip of Manhattan, and 20 miles from Midtown Manhattan, which may be reached by Metro-North Railroad (Scarsdale station). Scarsdale is also served by the Bee-Line Bus System. Home / Multifamily ONE DROMORE APARTMENTS ARCHITECT . PROJECT SIZE . PROJECT COST . SCOPE . Design, approvals and construction administration of mechanical, plumbing, sprinkler, electrical and fire alarm systems. Go Go One Dromore Apartments is a newly constructed 4-story residential building with 45 affordable rental units, ready for occupancy approximately August 2024. The affordable rental units are available by lottery to households between 40%- 80% of Westchester County’s Area Median Income. One Dromore Apartments will feature one- and two-bedroom apartments, including 5 units adapted for mobility impairments and 2 units adapted for hearing/vision impairments. Building amenities include all electric, passive house certified building, community room with kitchen, laundry room, fitness center, lounge/library, EV charging stations, free WiFi. Walking distance to Central Avenue shopping and public transport. One Dromore Road, Scarsdale, New York is surrounded by small businesses, shopping, and restaurants within walking distance to Central Avenue. Located approximately 7 miles to the border of New York City (in The Bronx), 11 miles from the northern tip of Manhattan, and 20 miles from Midtown Manhattan, which may be reached by Metro-North Railroad (Scarsdale station). Scarsdale is also served by the Bee-Line Bus System.

A 6-story, 63-unit supportive housing project in Nodine Hill neighborhood of Yonkers developed by Westhab Inc. Yonkers-based Westhab is a community development, social and housing services organization that builds and manages high-quality affordable and supportive housing in Westchester County and New York City. To date Westhab has developed over 900 units of housing with an investment of over $134 million Dayspring Commons will consist of four one-bedrooms, 45 two-bedrooms and three three-bedrooms. Formerly homeless people are expected to occupy 30 of the units; 10 of those apartments will target young adults with children and 20 of those units will target families with a mentally disabled head of household. Another 21 units will be affordable housing for families that earn less than 50 percent of the area median income for Westchester County. The proposed complex would sit next to the former Good Shepherd Presbyterian Church at 203 Elm St. The church is currently being renovated by Westhab and it is now called the Dayspring Community Center. Buildings’ mechanical systems include high efficiency condensing boilers designed to operate with low temperature water. Variable speed pumps, high output baseboard radiators, energy recovery ventilators and variable refrigerant flow systems for common areas. The building was provided with a gas-fired emergency generator. The project is designed to meet the latest Enterprise Green Communities requirements for energy and water conservation, resident health and well-being and resiliency. The buildings are at least 15% more energy efficient than the current energy code. Home / Multifamily DAYSPRING COMMONS, 227 ELM, YONKERS ARCHITECT . Aufgang Architects PROJECT SIZE . 65,000 SF PROJECT COST . $ 45,000,000 SCOPE . HVAC, sprinkler, plumbing and electrical power, fire alarm design and construction administration Go Go A 6-story, 63-unit supportive housing project in Nodine Hill neighborhood of Yonkers developed by Westhab Inc. Yonkers-based Westhab is a community development, social and housing services organization that builds and manages high-quality affordable and supportive housing in Westchester County and New York City. To date Westhab has developed over 900 units of housing with an investment of over $134 million Dayspring Commons will consist of four one-bedrooms, 45 two-bedrooms and three three-bedrooms. Formerly homeless people are expected to occupy 30 of the units; 10 of those apartments will target young adults with children and 20 of those units will target families with a mentally disabled head of household. Another 21 units will be affordable housing for families that earn less than 50 percent of the area median income for Westchester County. The proposed complex would sit next to the former Good Shepherd Presbyterian Church at 203 Elm St. The church is currently being renovated by Westhab and it is now called the Dayspring Community Center. Buildings’ mechanical systems include high efficiency condensing boilers designed to operate with low temperature water. Variable speed pumps, high output baseboard radiators, energy recovery ventilators and variable refrigerant flow systems for common areas. The building was provided with a gas-fired emergency generator. The project is designed to meet the latest Enterprise Green Communities requirements for energy and water conservation, resident health and well-being and resiliency. The buildings are at least 15% more energy efficient than the current energy code.

The development was acquired for $255 million, with total project costs projected at $500 million. Work will be funded through a mix of public and private financing, including New York State’s Housing Our Neighbors With Dignity Act (HONDA), New York City’s 15/15 Supportive Housing Initiative, HDC tax-exempt bonds, and HPD’s Supportive Housing Loan Program. Additional support includes financing from Wells Fargo, JPMorgan Chase, the Low Income Investment Fund, LISC Fund Management, and the Corporation for Supportive Housing. Historic and Low-Income Housing Tax Credits and transferable development rights have also been utilized. The Stewart Hotel, a 31-story building shuttered since 2022, is anticipated to take around 24 months to complete renovation. Construction will include merging adjacent rooms to create apartments, replacing mechanical systems, installing LED lighting, and building on-site social services offices. Support services for residents, including seniors and formerly homeless individuals, will be provided by Breaking Ground through a partnership with the NYC Department of Health and Mental Hygiene. Home / Multifamily STEWART HOTEL ARCHITECT . Aufgang Architects PROJECT COST . $500 million SCOPE . Design, approvals and construction administration of mechanical, plumbing, sprinkler, electrical and fire alarm systems. Go Go The development was acquired for $255 million, with total project costs projected at $500 million. Work will be funded through a mix of public and private financing, including New York State’s Housing Our Neighbors With Dignity Act (HONDA), New York City’s 15/15 Supportive Housing Initiative, HDC tax-exempt bonds, and HPD’s Supportive Housing Loan Program. Additional support includes financing from Wells Fargo, JPMorgan Chase, the Low Income Investment Fund, LISC Fund Management, and the Corporation for Supportive Housing. Historic and Low-Income Housing Tax Credits and transferable development rights have also been utilized. The Stewart Hotel, a 31-story building shuttered since 2022, is anticipated to take around 24 months to complete renovation. Construction will include merging adjacent rooms to create apartments, replacing mechanical systems, installing LED lighting, and building on-site social services offices. Support services for residents, including seniors and formerly homeless individuals, will be provided by Breaking Ground through a partnership with the NYC Department of Health and Mental Hygiene.

The Young Women’s Christian Association was founded in 1888. The goal of the organization was to provide a meeting place for young women who were employed in retail stores, as office workers and other occupations throughout Brooklyn. These young ladies could listen to lectures, concerts, enjoy the reading room, and receive Christian instruction, if so desired. It was the first major organization of its kind in Brooklyn to be entirely run by women. Home / Multifamily YWCA OF BROOKLYN ARCHITECT . PROJECT SIZE . 180,000 SF PROJECT COST . SCOPE . HVAC design, energy efficiency, CHP feasibility Go Go The Young Women’s Christian Association was founded in 1888. The goal of the organization was to provide a meeting place for young women who were employed in retail stores, as office workers and other occupations throughout Brooklyn. These young ladies could listen to lectures, concerts, enjoy the reading room, and receive Christian instruction, if so desired. It was the first major organization of its kind in Brooklyn to be entirely run by women.

This new nine story residential building, located on a vacant city lot designated as an Urban Development Action Area, offers 59 affordable residential units with rents set at 30, 40, and 50 percent of the area median income. IMPACCT Brooklyn serves as the social service provider for the building’s supportive housing tenants. Rising to a height of 97 feet, the building contains approximately 42,200 square feet of floor area and includes one superintendent’s unit, social services, administrative offices, and programmatic space to support the needs of its residents. IMPACCT Brooklyn, a nonprofit organization dedicated to preserving and developing affordable housing with a focus on economic mobility and racial equity, plays a key role in ensuring the success of this project. Providing much needed affordable and supportive housing in the Bedford Stuyvesant neighborhood, the building features amenities such as a green roof, indoor bicycle parking, a community room, a laundry room, and recreational outdoor spaces, including a rear yard and a rooftop area. Home / Multifamily 776 MYRTLE, BROOKLYN ARCHITECT . Urban Architecture Initiatives PROJECT SIZE . 42,000 SF, 9 stories, 59 residential units PROJECT COST . $18 million SCOPE . Design, approvals and construction administration of Mechanical, plumbing, sprinkler, electrical and fire alarm systems. A highly efficient building envelope. Heating and cooling with a 3 pipe heat recovery variable refrigerant volume heat pump and a passive house style ventilation via a rooftop ERV Gas fired high efficiency boilers used for domestic water heating system. Go Go This new nine story residential building, located on a vacant city lot designated as an Urban Development Action Area, offers 59 affordable residential units with rents set at 30, 40, and 50 percent of the area median income. IMPACCT Brooklyn serves as the social service provider for the building’s supportive housing tenants. Rising to a height of 97 feet, the building contains approximately 42,200 square feet of floor area and includes one superintendent’s unit, social services, administrative offices, and programmatic space to support the needs of its residents. IMPACCT Brooklyn, a nonprofit organization dedicated to preserving and developing affordable housing with a focus on economic mobility and racial equity, plays a key role in ensuring the success of this project. Providing much needed affordable and supportive housing in the Bedford Stuyvesant neighborhood, the building features amenities such as a green roof, indoor bicycle parking, a community room, a laundry room, and recreational outdoor spaces, including a rear yard and a rooftop area.