Retail space on a prime Midtown corner is getting a lot of attention from restaurateurs after Spin Burger Bar suddenly closed there earlier this month. On Thursday, Rocklin resident Paul Singh toured the 2,800-square-foot store, where he and partners in Monsoon Indian Bar & Grill of Toronto are considering opening an Indian restaurant and bar by the same name. Many other restaurant owners have already checked out the space at 1020 16th St. Spin Burger's owner, SRO Inc., closed the restaurant's doors July 5, said commercial real estate broker Bobby Rich with Retail West. The Haines brothers, who own 33rd Street Bistro and several other area restaurants under SRO, converted a Bistro 33 at