Parking Garage

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.

Whole Foods Market, P Street, NW

A 40,000 sf urban supermarket, with below-grade parking under the store, and roof-level parking over the store.  Separate circular ramps connect the under/over parking levels to street level.

The market’s truck loading/delivery dock is also located over underground parking.  Parking is provided for 165 cars: underground for employees and customer parking at roof level.  A later renovation to the store included a large mezzanine level.

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 View I, University of Maryland

Privately developed, this project was designed to meet the University of Maryland’s student housing specifications for its College Park Campus.  The new 16-story, post-tensioned concrete-frame, residential building contains 352 student-housing apartments for 1,091 beds and includes a walking bridge providing access to the university campus.  The building’s ground floor is designed to accommodate the surrounding 100-year flood plain from the adjacent creek.

The building’s amenities include a computer room, health club and lounge, jogging/biking trail system, internet cafe, and structured parking for 710 cars.  The parking structure is four levels of reinforced concrete, underlying the residential tower, and has a gross floor area of 255,000 sf.

HHS at Parklawn, 5600 Fishers Lane

Renovation of the Department of Health and Human Services’ (HHS) Parklawn Building to upgrade the facility into a Class “A”, LEED Platinum-certified office building with industrial loft aesthetics and innovative green features.  

Structural modifications included a 12-story vertical expansion to create a new atrium space.  The new atrium feature consists of a new floor at the main building level, along with new elevator and stair cores situated at the atrium corners, serving each level above the atrium floor.  The atrium is enclosed by a new steel-framed roof with 100-foot spans supporting a 100x100-foot ETFE skylight system.  Four existing elevator cores were demolished, removing off-grid columns that required new slabs as well as column jackets at the affected column bays.

Additional modifications included floor penetrations at existing slabs for new elevator and mechanical shafts, in-fill of existing abandoned shafts, FRP retrofits for the new facade and two-story lobby, and blast hardening at columns and slabs. 

Potomac Center South, 550 12th Street, SW

As part of the renovation and expansion of the Potomac Center building, the southern half of the existing concrete-framed structure was completed as Phase I of two phases.  Potomac Center South houses the U.S. Department of Education and has eight levels above-grade and three levels of parking below.  The existing space totaled approximately 250,000 gsf of occupied area plus 150,000 gsf of below grade parking.  The project also included the addition of 220,000 sf of new office space.

The horizontal expansion added reinforced concrete bays to floors two through eight.  The flat plate design of the expansion was similar to the original structure in order to allow for proper ceiling heights.  The building was also expanded vertically by adding three steel-framed levels above the original roof level, plus a new roof and penthouse, bringing the building to its new size of 11 stories.

The new upper levels were designed of composite steel, using 12-inch deep beams and girders in 20-ft. bays in order to minimize the dead load added to the existing columns and foundations.  Foundations were upgraded using mini-pile underpinning.  The entire facade was replaced and the core re-worked to accommodate new MEP systems. Structural security features were also added to meet tenant and GSA requirements.

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. 

Tivoli Theater Mixed-Use Development, 14th & Park Road

A mixed-use development, the project entailed the restoration of the existing 1920s era Tivoli Theatre in Columbia Heights for use as retail space on the ground floor, office space, and a new, 250-seat, live theater on the second floor.  The project’s scope also featured a new post-tensioned concrete building adjacent to the Tivoli Theater, housing a full-sized Giant Food grocery store and an additional two-story, steel-framed retail and office building with parking, flanking the Tivoli’s northside.

Renovations of the Italian Renaissance Revival-styled theater included a building structure evaluation, preparation of drawings and repair documents, and the performance of quality assurance inspections.  The load-bearing brick masonry had been severely worn and deteriorated and the building structure was undergoing severe corrosion of embedded structural steel elements resulting from water intrusion through cracks in the brick masonry, an open skylight, and failed roofing membrane.  In several areas, the level of corrosion reached the point of complete disintegration of structural steel members.  The structural instability that resulted created a life safety hazard and threatened the structural integrity of the building.

Extensive analysis of the load-carrying capacity of various structural elements led to a successful repair design.  The theater was restored to structurally-sound condition without compromising the building’s historical integrity.

The Wharf, Phase 1, SW Waterfront

Under a teaming arrangement with another structural firm, SK&A is providing structural engineering services for this multi-phased, mixed-use waterfront redevelopment, located on the historic Washington Channel adjacent to the L’Enfant Plaza and the Waterfront Metro Stations.  The master plan for the high-profile waterfront development integrates residential, office, retail, hotel and cultural facilities with numerous public spaces, including a three-acre waterfront park, along 27 acres of land overlooking the Potomac River.

SK&A is providing structural design services for three of five total parcels in Phase 1 of the project. A two-level, below-grade parking garage (782,000 sf) supports all of the parcels and is constructed over WMATA’s yellow-line tunnel.  Parcel 3 is divided into two sections: 3A includes an office building (200,000 gsf) with 20,000 gsf of ground floor retail; 3B will include a 12-story hotel (238,000 gsf) with 268 rooms, restaurants, bars, ballrooms and other meeting/event spaces, a spa, and retail space.  Parcel 4 will consist of a 12-story mixed-use residential building, evenly divided between apartments and condominiums (310,000 gsf).  A 50,000 gsf health club and 25,000 gsf of retail space will also be included in this structure.  Parcel 5 will include two hotels housed in a single building (250,000 sf).  

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