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River Farm greenhouse proposal prompts questions over demolition of contributing garage
Summary
At a workshop, the American Horticultural Society proposed replacing a North Garage at River Farm with a 400-square-foot greenhouse that would reuse the existing foundation; ARB members pressed the applicant for stronger historical justification, a clearer case for demolition of a contributing resource, and design adjustments to reduce visual prominence.
The American Horticultural Society (AHS) presented a proposal to replace the North Garage at River Farm with an approximately 400-square-foot greenhouse at a Feb. 12 workshop before the Fairfax County Architectural Review Board.
Patty Taylor of Walsh Colclough (presenting for the applicant) said the greenhouse would be constructed within the existing footprint, reuse the concrete foundation where feasible, and use reclaimed brick or masonry from the original structure to remain contextual with the manor house and carriage house. "We would not be expanding the house beyond what the existing North Garage is today," she said.
While several board members expressed support for the site's educational mission and the value of a greenhouse, they pressed the applicant on multiple points. Board members questioned whether the North Garage should be treated as a contributing resource, asked for a clearer historical timeline and documentation, and suggested the applicant better justify demolition rather than repair.
"Disposing of a building because of neglect or poor maintenance, that is not the building's fault," said a board member who emphasized that eliminating buildings because they became 'eyesores' without full documentation is a "slippery slope." Another asked the applicant to show how the proposed roof pitch, cresting and overall profile would be deferential to the historic manor and carriage house and not compete visually.
AHS representatives and supporters argued the structure has been a programmatic constraint and that reuse of the north garage location avoids additional site disturbance and archaeological risk. Scott Fine, representing AHS, said the knee wall is important for greenhouse function and that the selected materials will help the structure tie into the estate and support education and public programming.
Staff and board members told the applicant to consult zoning on whether demolition or an administrative approval is feasible within the current footprint and to return with stronger documentation, including aerials, dates for buildings on the site and a clear argument about how the greenhouse will fit programmatically and visually. Board members also suggested a modest design refinement—lowering or toning down roof pitch and removing ornate cresting—to reduce the greenhouse's perceived prominence at the main entry from the parking lot.
Next steps: applicant will refine the design, assemble additional historical and visual evidence, coordinate with zoning and staff about required approvals, and return to ARB for further review and a formal application if needed.
