On July 18, 2026, the Arlington County Board approved a major 4.1 site plan amendment to transform two vacant office buildings at 1400 Wilson Boulevard and 1401 Key Boulevard into a vibrant mixed-use development featuring residential uses, neighborhood-serving retail, a grocery store, and significant public open spaces.
The approval marks the culmination of an extensive planning and entitlement process and represents a major milestone in realizing a vision for this prominent 2.1-acre site that has been more than a decade in the making.
Monday Properties originally secured approval to redevelop the site in 2014 with a mix of office and residential buildings, including a 44,000-square-foot grocery store. Changing market conditions, however, prevented that development from moving forward.
Over the ensuing decade, Monday Properties worked with its design team to reimagine the project to respond to current market conditions while preserving—and in several respects enhancing—the public benefits and urban design commitments envisioned for the property.
As approved, the project features two 27-story residential towers containing a combined 831 residential units, along with approximately 29,000 square feet of ground-floor retail. Importantly, the project also preserves the longstanding commitment to bring a grocery store to this portion of Rosslyn, with approximately 17,000 square feet dedicated to a new grocer.
Central to the project is the completion of the western bookend of Rosslyn’s planned 18th Street Corridor, a signature public-space and pedestrian connection envisioned by the Rosslyn Sector Plan.
The 18th Street Corridor will serve as the project’s defining public open-space feature, providing a new pedestrian connection through the site while helping overcome the substantial grade changes that have historically complicated pedestrian circulation in this portion of Rosslyn.
The redesigned 18th Street Corridor will incorporate extensive landscaping, biophilic design elements, mid-block pedestrian crossings, a monumental staircase, and a publicly accessible elevator to improve accessibility.
The proposed grocery store has also been strategically repositioned to front directly onto the 18th Street Corridor, increasing its visibility from Wilson Boulevard and bringing activity to one of the development’s principal pedestrian spaces.
Throughout the property, a coordinated network of landscaped areas, overlooks, perches, and bioretention facilities will complement the 18th Street Corridor and create a more welcoming pedestrian environment.
The approval includes a substantial package of community benefits that extends beyond the project’s residential and retail components. These include significant infrastructure investments, contributions to Arlington County’s Affordable Housing Investment Fund above the project’s base affordable-housing contribution, and additional monetary contributions supporting public open space, transportation improvements, and historic preservation.
From an environmental perspective, the project will achieve LEED Gold certification and exceed applicable Rosslyn Sector Plan sustainability requirements, including a 20 percent improvement in energy performance. Additional commitments include electric-vehicle charging infrastructure, Energy Star appliances, WaterSense fixtures, and bird-friendly glass.
The approved plan evolved significantly through Arlington County’s public review process. Over many months, Monday Properties and its design team worked closely with County staff, advisory commissions, and community stakeholders to refine the project’s elements.
The result is a project that advances several of Rosslyn’s most important long-range planning objectives, and represents an important step in Rosslyn’s continued transformation into a dynamic, residentially focused, mixed-use urban center.
Walsh Colucci shareholder Andrew Painter, alongside Associate Jessica Washington and land use planner Elliott Young, represented Monday Properties throughout the entitlement process.
