Mixed-Use

International Spy Museum at L’Enfant Plaza

Designed by the renowned architectural firm of Rogers Stirk Harbour + Partners and local architectural firm, Hickok Cole, the International Spy Museum is a new contemporary building featuring museum exhibition, office, retail, classrooms, and event spaces, a glass atrium at the western side, a new 1st floor (exterior plaza and interior lobby and retail space), and a rooftop terrace.  The total height of the building is approximately 130 feet above the 1st floor and is adjacent to the L’Enfant Plaza Hotel.

The west side of the building is an open atrium space that cantilevers west of the property line and hangs a dramatic glass veil structure.  The atrium platforms, monumental stairs, and their supporting structural elements all consist of custom fabricated, architecturally exposed, structural steel elements.  These elements have surface preparation levels, paint, and lighting patterns that provide a dramatic showcase finish for the entire atrium. 

The building structure above the 1st floor is composed of composite steel framing with concrete-on-metal deck and steel columns.  Below the 1st floor, the existing building’s conventionally reinforced concrete structure and foundations were strengthened to accommodate the new seven-story vertical expansion.  The existing concrete columns were jacketed and new concrete shear walls were introduced in the existing building structure.  Foundations were either enlarged and/or strengthened with micropiles.

Watch this video about the design & construction of the museum.

View photos from the museum's opening night.

The Yards, Parcel O

Situated in Washington, DC’s Capitol Riverfront neighborhood, The Yards is a 42-acre, 5.5 million sf mixed-use redevelopment featuring residential, office, and retail spaces as well as restaurants and a public park.  SK&A is providing structural engineering services for two residential buildings being constructed simultaneously on Parcel O of the development.

The Bower, on Parcel O-1, is a 154,400 gsf, 10-story residential building with 138 condominium units.  Parcel O-2 is a 208,700 gsf, 10-story residential building with 198 units.  Both buildings feature ground floor retail, indoor amenity spaces, lobbies, green roofs, a public courtyard, and a shared two-level, underground parking garage with a flood-resistant design.

The buildings are being constructed over WMATA’s Green Line tunnels, which required that structural analyses be performed to demonstrate the tunnels’ capacity and stability to resist the forces imposed by the unloaded condition during construction and the final condition when the buildings are complete.  

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. 

Liberty Center (Ballston Metro Station)

This 5.35 acre mixed-use development includes two office buildings, a residential tower with retail, and structured below-grade parking. Located at 675 Randolph Street in Arlington, VA, the first 13-story, 350,000 sf office building was completed in 2012 and includes a 250,000 sf structured parking garage for 600 cars that resides underneath.  The building is designed to meet Anti-Terrorism Force Protection (ATFP) standards for occupancy by a government agency.  

The 17-story residential tower was completed in 2014.  The 238,000 sf building has 256 units, 9,000 sf of retail, and a 120,000 sf structured parking garage for 272 cars. 

To be completed in 2016, the third building is an additional 20-story, 400,000 sf Class “A” office building.  Located at 4040 Wilson Boulevard, the structure will be the tallest office building in the Arlington corridor.  The development is certified at the Gold level under the LEED-ND (Neighborhood Development) pilot program.

City Vista (Wax Museum Site), 5th & K Streets, NW

Located on the former Old Wax Museum site and in walking distance to the Washington Convention Center, this mixed-use residential/retail development on the 3.2 acre site contains a total of 685 condominium and apartment units, a 55,000 sf Safeway grocery store, 65,000 sf of additional retail space, and 830 below-ground parking spaces.  The project’s residential units were divided among two condo buildings, “The K” and “The L”, both 12 stories, and one rental apartment building standing nine stories tall, “The V.”  Additional amenities for the residents include a rooftop pool, a large third floor courtyard landscaped with tree pits, a large truck loading dock serving the residential units and the retail rooftop terraces, and a second floor fitness center.

The design of the buildings entailed several structurally challenging features including the vertical transition of the building’s columns and walls from garage to retail and then to residential-architectural floor layouts.  A large amount of transfer girders and sloped columns were introduced on different levels of the structures to accommodate the transitions.  The Safeway grocery store beneath the residential building required 55,000 sf of two-story open space.  This necessitated 30-foot tall unbraced columns that support the residential building above.

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.

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