Mixed-Use

The Boro

Situated on “The Hill,” Fairfax County’s highest elevation, and in walking distance to the Greensboro Metro station on the Silver Line of the Washington area’s subway system, The Boro is a new, mixed-use, transit-oriented, urban-style community within Tysons, VA.  Totaling 4.25 million square feet on 18.1 acres, the development integrates a mix of residential, office, retail, and entertainment buildings along with 4.23 acres of community green spaces.   

SK&A provided structural engineering services for a two-level upscale, luxury movie theater, and a new 20-story class “A” office tower.  The Showplace Icon theater (94,800 sf) includes 14 state-of-the-art screens and upscale dining options.  The Boro Tower (345,000 sf) includes ground level retail (8,260 sf) and five levels of below grade parking for 1,200 spaces.  The building also features a glass curtain wall and up to 10-foot ceiling heights.    

The Tides Apartments and Pendry Hotel, The Wharf Parcel 8

Situated on the edge of the Potomac River, the Wharf Parcel 8 also known as the Tides Apartments and Pendry Hotel, pushed the boundary of sloped buildings.  With 13 stories of hotel on the west side and 13 stories of residential units on the east side, the U-shaped building creates unobstructed views of the Potomac River for both functions.  This was imperative to the architectural design of the building. 

Located directly over the underground METRO green line tunnels, the new foundations needed to adhere to the strict requirements of the Washington Metropolitan Area Transit Authority for building overtop of an existing operational tunnel.  A hybrid system of a mat foundation and spread footings were used to help reduce the surcharge on the tunnel below as well as create an economically efficient design for the foundations.  Noise and vibration from the tunnel below were also a concern.  An isolation pad under the mat foundation, spread footings, and columns were used to mitigate any noise and vibration from the tunnel below that would propagate through the first several floors of the building. 

West Half Street

Situated directly across from the new Washington Nationals Stadium, West Half Street is a 13-story residential building featuring a modern, high-end, canti-levered design with gradually alternating and descending outdoor terraces.  The building includes 465 apartments in studio, one- and two-bedroom layouts, 61,000 sf of retail on two floors, and multiple amenities such as a rooftop pool, penthouse lounge areas/clubrooms, and a central courtyard.  The aboveground structure sits atop a three-story underground garage with 329 parking spaces.  

The building was designed to be the crown jewel of the surrounding development area providing residents with unobstructed views of the baseball stadium and surrounding Navy Yard waterfront neighborhood.  SK&A worked with the architect to design a building that continuously rotated and twisted which allowed for these views.  To support the large cantilevers from the building face, Y-branch columns with tie-beams were utilized.  Strategically placed concrete shear walls resist the building’s natural tendency to twist and rotate under its own self-weight.  The Y-branch columns were also designed to support the ends of the ever-increasing cantilevers.

The completed design culminated into a graceful, functional, and exceptional residential structure that adds to the diverse architectural fabric of the Navy Yard waterfront neighborhood.  The building’s new residents will enjoy prime views of game-day action with personalized experiences of the surrounding ballpark atmosphere.   

 

800 Maine, The Wharf Parcel 3A

Part of a 3.3 million sf mixed-use development situated along Washington DC’s Southwest Waterfront, The Wharf Parcel 3A also known as 800 Maine, is an 11-story, 233,000 sf Class “A” office building.  The office building is constructed atop a shared two-level underground garage occupying the entire project site.  The superstructure and underground garage are concrete-frame with conventionally reinforced floor slabs, reinforced concrete columns (typically 30-ft. apart), concrete shear walls, and select post-tensioned concrete components.

The building is also located in a section of the site where WMATA’s Yellow Line metro tunnel and air intake shaft conflict with the western side of the building’s columns and foundations.  To bridge over the existing WMATA structures, a solution was executed using underground concrete transfer girders over the tunnel and a two-story elevated steel truss between levels 2 to 4, which spans 90 feet. 

The SK&A team’s structural ingenuity and close collaboration with the owner, architect, and design builder ultimately delivered a visually appealing and structurally sound building, with WMATA’s structures intact and operational during construction.

Arundel Town Center

Located in Hanover, MD on the Baltimore-Washington Corridor, the Arundel Town Center is a component of the Arundel Preserve, a 268 acre, smart-growth mixed-use community within the larger 1,100 acre Arundel Mills development. Developed in multiple phases, the project includes a hotel, residential and retail structures.

The hotel phase of this project involved the construction of a seven-story above-grade, 150-room hotel building that included retail space at the ground floor level.  The building’s substructure and superstructure consist of cast-in-place concrete footings and walls with conventionally reinforced slabs and post-tensioned slabs in the tower.

The residential phase of the project involved the construction of a multi-family residential structure consisting of five to six levels, as well as three stories of retail space with an attached five level parking garage. The project also includes a clubhouse with a swimming pool in the courtyard.  The building’s substructure and superstructure consist of cast-in-place concrete footings and walls with Hambro system floor joist slabs and the precast concrete parking structure.

The parking garage phase of this project involved the construction of a seven-level above-grade cast-in-place concrete parking structure, consisting of footings, columns and walls with post-tensioned reinforced slabs.

SK&A provided structrual design services as well as testing and inspection services including concrete, masonry, and structural steel construction, EIFS observations, field testing, and visual weld inspections.

Constitution Square

Located at First and M Streets, NE, in the vibrant NoMa neighborhood, Constitution Square is a 3.1 million-square-foot, multi-phased, urban mixed-use complex featuring multiple office, residential, hotel, and retail buildings. SK&A was selected to provide structural engineering services for the Class “A”office buildings, Three Constitution Square (OB3) and Four Constitution Square (OB4), as well as Residential Building Two (RB2), a 13-story apartment building.  SK&A also provided special inspection services for construction of a 12-story office building (OB3) over a two-level parking garage.  The construction of the building is a conventionally reinforced slab in the substructure and post-tensioned reinforced slabs in the superstructure levels above. 

Special inspection services were also provided for construction of a 13-story residential building (RB2) over a three-level below grade parking garage.  The substructure of the building (mat foundation, foundation walls, slabs, and columns) consists of conventionally reinforced concrete and the superstructure consists of post-tensioned reinforced concrete slabs above grade.

Flats 8300, 8300 Wisconsin Avenue

SK&A provided structrual engineering services for the Flats 8300, a nine-story, 714,000 sf mixed use building with 359 residential units, a two-level Harris Teeter grocery store, and four levels of below grade parking.  Building amenities include a rooftop swimming pool with space for entertaining, a clubroom, a fireside lounge, a fitness center, and a business center.

SK&A's scope of services also included various inspections of the earthwork/foundations, structural concrete, masonry, structural steel, cold-formed metal framing, fireproofing, and waterproofing as well as post-installed anchor testing and inspection.  The project is slated for LEED Silver certification.

Park Van Ness

SK&A provided structural engineering services for this mid-rise, residential over retail project facing Connecticut Avenue.  The rear of the project site overlooks Rock Creek Park.  The new building replaces a previous retail strip mall and contains 272 apartments, below-grade structured parking, and a street-level retail component.

The above grade residential tower is constructed of two-way post-tensioned flat plate concrete.  A below-grade parking structure consists of a poured-in place conventional concrete slab.  SK&A also served as the Special Inspections Engineer-of-Record for the project.  Our scope of services included various inspections of the earthwork/foundations, excavation support, structural concrete, architectural and structural precast concrete, masonry, structural steel, cold-formed metal framing, fireproofing, waterproofing, roofing, and building envelope.

The Yards, Parcel L

SK&A provided structural engineering services for the design and construction of the new Thompson Hotel and Estate luxury apartment buildings.  The new buildings are located on parcel L of The Yards, a 42-acre mixed-use, waterfront redevelopment situated along the Anacostia River in Southeast, Washington, DC.

The buildings are designed with joint access between them and are constructed atop of  a shared, below-ground, two-level parking garage.  The project designs also included navigating around a large underground sewer line at the northern end of the site.

  • The Thompson: The upscale Thompson Hotel is part of the Hyatt hotel portfolio.  The 10-story building includes 38 luxury suites, a restaurant at street level, rooftop bar, fitness center and meeting/event space.  
  • The Estate: A luxury, high-rise apartment building with 285 residential units.  The building features ground floor retail and amenities such as, several community lounges (garden, media, work), rooftop swimming pool, indoor spa/whirlpools, fitness center, and pet spa.

Midtown Center/Fannie Mae HQ

SK&A provided structural engineering services for a new headquarters building for the Federal National Mortgage Association (FNMA), commonly known as Fannie Mae.  The new 875,000 sf Midtown Center office complex is comprised of two 14-story towers, East and West.  The structure features 45,000 sf of retail space, multiple three-story atria, three levels of below-grade parking, as well as a fitness center, rooftop terrace, and private alley.  The project also includes a 15,000 sf public courtyard surrounded by the buildings on three sides and is activated by ground floor retail.

A unique and distinct design feature within the complex are its three interconnecting “tunnel” bridges which span more than 110 feet across the site’s courtyard, connecting the east and west towers at levels 9 through 14.  The bridges feature interior walkways (inside of the bridges) and exterior walkways (on top of the bridges, open to the air).  The bridges were typically designed as “king-post” trusses utilizing heavy W36 section for top chord, eight-inch square tube steel section for bottom chord, and two (2) three-inch diameter high-strength tension rods by “Macalloy” as diagonal members connecting to an eight-inch square tube section vertical steel post, at the center of the bridge.

The three-story, below-grade parking deck uses conventionally reinforced concrete flat slab construction.  The courtyard slab and private alley above the top garage level is designed for landscape and fire truck loads.  The office level structural framing consists of eight-inch, post-tensioned concrete slab with eight-inch-thick drop panels over columns.  This efficient framing system allowed sufficient plenum space for the installation of MEP systems within the ceiling as well as the curtainwall anchors.  The project will pursue LEED Gold certification.  

View photos from a 2017 Site Visit.

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