Novare, the developer of 360, has announced preliminary plans for two new towers to rise one block west of the downtown post office. The new plans call for construction of a 250 unit 28-story condo tower and an adjacent 16-story office tower on the 1.2 acre site bounded by Fifth, Sixth, San Antonio and Nueces streets.The new project, to be called Ovation, replaces earlier plans for a larger 400-unit condo development on the same site. Novare's 360 was one of the largest . . .