Bedroom, Light Hardwood Floor, Bed, Storage, and Table Lighting The loft's original 1928 concrete is in tact, and while the design team sandblasted it all, not everything was removed—the owners will often find things like nails and pieces of cork in the material.   Photo 4 of 13 in A Knitting Mill in San Francisco Becomes an Unbelievable Loft For Two Art Collectors

A Knitting Mill in San Francisco Becomes an Unbelievable Loft For Two Art Collectors

4 of 13

The lofts's original 1928 concrete is intact, and while they sandblasted it all, not everything was removed—the owners will often find things like nails and pieces of cork in the material.