A New York developer is working on plans to put nine floors on the top of a downtown Boston parking garage. “Fortis Property Group filed initial plans Monday with the Boston Planning & Development Agency to build 195 residential units atop the Dock Square Garage on Clinton Street along the Rose Fitzgerald Kennedy Greenway near Quincy Market.” In September, Fortis paid $170M to buy the 698-space garage, also home to The Hard Rock Café, with plans to develop it. The plans call for re-cladding the structure, minimizing the parking garage to 538 spaces, and a nine-level, 194-foot addition that will spiral upwards. “It was not clear from Fortis’ letter of intent whether the building would be condos or apartments, but Fortis said it would set aside 25 units in the building for affordable housing, as required by the city.” This plan is the latest in a string of recent projects in Boston that are building on top of existing parking structures. This design allows developers to save money and the time of building new foundations while preserving valuable parking spaces. In Dock Square’s case parking fees can be upwards to $36.00 for two hours.