About 1920 Alton 1920 Alton Rd Miami Beach, FL 1920 Alton is a proposed 5-story mixed-use project that will feature 25,223 square feet of Class A office space, 8,284 square feet of restaurant space at the ground level (split between two separate tenants), three residential units that will total approximately 13,271 square feet and a screened-in parking garage on the second level with 45 spaces.