NEW YORK CITY — Through foreclosure proceedings, Madison Realty has taken ownership of 364 Bay St., a stalled 55,000-square-foot retail center near the St. George waterfront. The firm plans to finish and lease the two-story retail project, which is slated for completion by the end of 2013. Madison purchased the defaulted first mortgage note and second mortgage note with an unpaid principal balance of $2.9 million from a local bank. The previous owner had acquired the land for $4.5 million and had spent an additional $2.5 million on improvements when construction was halted during the downturn. When Madison completes the project, the property will feature more than 40,000 square feet of retail space.