Brooklyn-based Infinity Properties NYC has filed applications for a four-story, seven-unit residential building at 171 Concord Street, in Downtown Brooklyn. The project will measure 7,388 square feet and its residential units should average 707 square feet apiece, indicative of rentals apartments. There will be one apartment across the ground and cellar levels, followed by two per floor on the second through fourth floors. Forest Hills-based ARC Architecture + Design Studio is the architect of record. The 2,500-square-foot plot is occupied by a single-story warehouse. Demolition permits were filed earlier this month.