Mixed-Use

Atlantic Plumbing, 8th and V Streets, NW

The former Atlantic Plumbing site, located along 8th and V Streets near Florida Avenue, NW, includes three separate parcels A, B and C.  SK&A provided structural engineering services for the development of Parcels A and B which include two new, luxury, urban high-design residential buildings with ground-level retail spaces and underground parking for 190 cars.  Parcel C, which is currently under design, includes a nine-story hotel and a 10-story residential building connected together by a bridge spanning W Street, NW.  

The first building at 2112 8th Street, NW (Parcel A) is a 10-story, cast-in-place concrete building with 339 units and two levels of below-grade parking.  Building amenities include a rooftop pool, bar, kitchenettes, movie screening area, vegetable garden plots, a business center, communal lounge area with theater, a fitness center, and bicycle storage rooms.  To give the building an edgy, industrial look, the exterior exo-skeleton frame of the building is comprised of Corten weathering steel.  The design and detail of the steel frame exo-skeleton is designed to resist both lateral and thermal loads.

2030 8th Street, NW (Parcel B) includes a second building with six stories and 71 condominium units.  This smaller building is a cast-in-place concrete structure with one level of below-grade parking.  The building features 10’ ceilings, rooftop terraces, a business center, as well as fitness and bicycle storage rooms.

In addition to traditional retail, the project includes 1,500 sf of artist studios occupied by the Washington Project for the Arts as well as a 10,000 sf Landmark movie theater.

The Calvert Apartments

SK&A provided comprehensive structural engineering services for the renovation and reconfiguration of The Calvert Apartments from a dated high-rise building, into a contemporary, mixed-use residential complex. The development features a central 16-story modernized tower with two new apartment buildings on each side as well as underground parking.

The new apartment buildings consist of four levels of post-tensioned concrete over a reinforced concrete retail level.  The first level above the retail floor is an 18” thick transfer slab.  The buildings also feature green roofs, amenities, and three levels of parking below ground.

The project totals 114,000 sf of residential space amongst the two new apartment buildings, 14,200 sf of retail space, 205,000 sf of underground parking for 522 cars and 193,000 sf of renovated residential space within the existing high-rise apartment building. The revitalization of the high-rise portion of the project was extensive and required multiple improvements, including:

  • Replacement of the building’s exterior skin 
  • Addition of a new roof parapet wall 
  • Design of a new building entrance canopy 
  • Enclosure of the existing ground level drive-through at the building entry and addition of four new units within that space
  • Underpinning of the existing building foundations along the new garage 
  • Replacement of the wall assembly with new curtain wall and arched roof profile 
  • Configuration of a new pool
  • Expansion of the existing penthouse levels
  • Modification of two existing elevators 
  • Addition of a new freight elevator and two new elevators to serve the low-rise residential
  • Demolishment of the first floor slab within the hi-rise; the floor was reconstructed to match the first floor level of the new low-rise 
  • Addition of new connection corridors between the new buildings, the hi-rise tower, and new loading dock areas

L’Enfant Plaza East & West Retail Renovations

Located in Washington, DC’s southwest quadrant across from the National Mall and Smithsonian Museums, L’Enfant Plaza is a massive mixed-use, commercial complex of multiple mid-century buildings originally constructed in the 1960’s.  The complex features office/commercial and governmental buildings, a hotel, an underground shopping mall and parking, as well as a major subway station.  The overall complex has been undergoing an extensive renovation and redesign, including the redevelopment of the retail mall as well as the existing L’Enfant Plaza hotel and an office building.  A new 600,000 sf office building will also be constructed in the center of the plaza. 

The retail renovation projects included modernization of the existing underground retail mall, the development of a new glass atrium providing access to the underground retail corridor, and structural strengthening at the promenade and plaza levels to accommodate the future nine-story office building.  The strengthening work for the office building was conducted concurrently with the retail renovation to allow retail operations to continue uninterrupted during construction.

For the strengthening portion of the project, a cost-effective demolition concept was devised involving almost no re-shoring of the existing slab.  New concrete framing was constructed over an existing auditorium occupied by the National Transportation Safety Board (NTSB).  To construct the framing, SK&A assisted the contractor in developing a steel formwork system using new and existing columns for support.  A grid of compression beams was also designed to support the plaza layout and future office building concept.  

The large glass atrium portion of the project is composed of a series of steel moment frames.  Slip-critical bolts at the column-to-beam connection were used to accommodate the contractor’s preference for steel erection.  Additionally, the east stair spans between the promenade and plaza levels, with no posts beneath the landings.

The East and West portions of the renovation were designed and constructed as two separate projects.  The West project received an SEA-MW award in the $15-40 Million Renovation category in February 2015. 

Woodland Park Crossing

A very successful, open town center-style, mixed-use development on eight acres with residences, retail spaces, and multiple parking areas located on Sunrise Valley Drive in Herndon, VA.  Building #1 (355,000 sf) is a ground-level Harris Teeter grocery store with two levels of parking above and one level below the store.

Buildings #2 (13,200 sf) and #3 (34,600 sf) are two-story retail buildings.  Building #4 has 14,700 sf of ground floor retail with three levels of stick building residential above (50,000 sf).  Buildings 5A and 5B are both residential wood-framed residential buildings totaling 168,000 sf.

Wisconsin Place (Friendship Heights Metro Station)

A large mixed-use, residential, retail, and commercial development at the intersection of Wisconsin and Western Avenues in Chevy Chase, MD.  The project contains a 15-story, 433-unit residential tower (480,000 sf), a new community center, a full-size Whole Foods grocery store, a 10-story office building, a new Bloomingdale’s department store, and two separate street-level retail buildings—all underlain by three levels of underground parking for 1,800 cars.  The residential tower is of post-tensioned concrete with a glass and masonry exterior.

Wisconsin Place was developed through a partnership of three national developers.  The components of the project were subdivided by a complex system of horizontal and vertical phasing lines, requiring challenging coordination between the various development and design teams.  SK&A served as the Structural Engineer of Record for the entire development.

West Grace Street Housing, Virginia Commonwealth University

A 161,078 gsf, five-story student housing building and a new independent 98,700 gsf, five-level parking structure for 212 cars.  The facility included 122 housing units for 459 beds and two private courtyard gardens, ground-level retail bays, and a new sculptural steel and glass trellis entrance.

The housing structure consists of pre-engineered light-gauge metal roof trusses, hollow core precast concrete floor plank, light-gauge metal bearing/shear walls, and a composite steel-framed transfer level at the second floor to accommodate first floor retail, office, and community spaces.  The parking structure consists of pre-cast concrete double-T’s supported on pre-cast concrete bearing walls and girders.  Foundations for both structures are conventional spread footings.  The facility achieved a LEED Silver certification.

University Hall at George Mason University

A new five-story administration building on the main campus of George Mason University.  The building is a long-span, steel-framed structure housing ground floor classrooms and retail establishments, as well as office and support functions on the upper four levels.  The building’s design incorporates an inverted pyramid layout, supporting a sloping front facade that provides additional floor space with each successive floor.

Developed by the George Mason University Foundation, the project’s design and construction were subject to Virginia’s Bureau of Capital Outlay Management’s (BCOM) review process and standards.

The Corporate Office Centre at Tysons II

This massive, mixed-use complex encompasses 5.9 million square feet of commercial, residential, and retail construction in 10 high-rise buildings with structured parking for 12,000 cars. The privately-developed project accesses the Tysons Corner Metro-rail station via an elevated pedestrian bridge. Specific buildings within the development’s larger master plan include:

  • Tysons II Office Building F, PricewaterhouseCoopers Offices: Located at 1800 Tysons Boulevard, this world-class 320,000 sf, 15-story office tower was awarded the NAIOP 2005 Award of Merit for Best High-Rise Building.  The tower is dramatically elevated on five foot deep cantilever girders, supported on stainless steel bearings atop elongated columns.  Other dramatic structural features include a 36-foot long cantilevered restaurant that "floats" above the landscaped courtyard below, as well as folded concrete plate features at the roof and lower canopy levels.  A separate 275,000 sf, nine-story pre-cast concrete parking structure for 840 cars connects to Building E’s existing parking structure via elevated bridges.
  • Tysons II Office Building H: The latest installation for the Corporate Office Centre is a 17-story, 476,000 sf office building eaturing a two-story, light-filled lobby and retail center with an iconic staircase and dramatic water feature, as well as other amenities, such as a conference center, fitness center, and café. The building’s 15 floors of office space sit above the two-story glass-enclosed lobby and retail center.  The third floor, directly above the podium, is cut back to the inner column line creating a strong reveal in the building’s form and providing a large external terrace for tenants.  The scheme also incorporates a pre-cast concrete garage on 11-levels for 1,185 cars as well as a 450-foot long enclosed pedestrian sky bridge that skewers through the building lobby and connects an existing parking garage across Tysons Boulevard to the new parking structure.

Turnberry Tower, 1881 Nash Street

A 25-story luxury condominium building containing 247 units (649,000 sf) and five levels of underground parking for 510 cars (220,000 sf).  The project’s design features a curved façade along the east and west sides of the building’s exterior, with continuous, extended balconies on each floor.  The high-rise is one of the tallest buildings overlooking the Potomac River, with sweeping views of Washington, DC, and its many monuments and structures.  To economize the structural system and cladding, wind tunnel testing was performed.

The building’s ground level contains a lobby, administrative space, spa and fitness center, boardroom, café, catering kitchen, and lounge with bar.  Additional amenities include an outdoor terrace and indoor pool with changing rooms.  The residences range from one- to four-bedroom layouts, with several units incorporating private, direct-entry elevators. 

Towers Crescent w/Pedestrian Bridge

A 13-story, Class “A” office building located in the Towers Crescent mixed-use development.  The building contains four levels of structured parking with a ground-floor restaurant and retail space.  The height of the building is 230 feet (to the top of the decorative crown) and is constructed of reinforced concrete.  

The gross floor area of the building including retail is 305,000 sf.  There is also 350,000 sf of parking for 950 cars and a 60-foot long pedestrian bridge connecting the project to Tysons Corner Center.  The structure also features a south-facing brick façade opposite a curved glass curtainwall.

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