At number 27 on Philly YIMBY’s December 2020 Development Countdown is the vertical addition proposed at 1810 Chestnut Street in Rittenhouse Square, Center City, which will add a slender 19-story structure atop an existing Freeman Auction House, bringing the total to 312 feet and 25 stories in height. Designed by Eric Leighton of Cecil Baker + Partners Architects and developed by Astoban Realty Group, the proposal will preserve the original prewar building’s façade and use the lower floor space for a commercial tenant, resident/tenant storage, parking, retail, and amenity space. The new tower will feature residential space, with the floors 20-24 split into two penthouses beneath the mechanical level at the 25th floor. Philly YIMBY’s recent site visit has revealed no progress at the moment, though a construction permit was issued on November 24.