1129 20th Street Office Building
Washington, D.C.
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OWNER: Liberty Property Trust
13655 Dulles Technology Drive, Suite 120, Herndon, VA 20171
ARCHITECT: Fox Architects
1121 14th Street, NW, Washington, DC 20005
CONTRACTOR: Jones Lang LaSalle Construction
81801 K Street, NW, Suite 1000, Washington, DC 20006
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1129 20th Street is located between L and M Streets, NW in downtown Washington, DC. The existing 8 story building was constructed in 1968 and had no significant upgrades until the renovation was begun in 2007. The added 45,000 square feet, comprised of adding two floors vertically
and infilling three of four corners full-height, is a 33% increase over the existing 136,000 gsf.
The additions and renovations breathe new life into an old building. The structural steel fabrication and erection were nearly flawlless, due to close coordination with the steel subcontractor during the shop drawing process. With ceiling heights of 8'-4", the steel beams and girders were designed with openings for ductwork and piping. A total of 202 openings were included on the design documents and detailed by the steel fabricator.
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