user: Question: What's the least amount of floors at 921 SW Sixth Avenue?
Columns: ['Name', 'Street address', 'Years as tallest', 'Height feet / m', 'Floors']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['Wells Fargo Building', '309 SW 6th Avenue', '1907–1911', '185 / 56', 12.0]
SQL:

assistant: SELECT MIN("Floors") FROM "Table" WHERE "Street address" = '921 SW Sixth Avenue';