SAN FRANCISCO — San Francisco lawmakers have postponed voting on a proposal that would make the city home to some of the smallest apartments in the country.

The city's Board of Supervisors had been expected Tuesday to consider a building code change to allow apartments as small as 220 square feet. The super-tiny efficiency units would include a bathroom, kitchen and closet.

Current regulations require apartment living rooms alone to be that size.

Supervisor Scott Wiener asked to delay a preliminary vote on the issue until Nov. 13 so he could continue discussions with critics who fear the super-small apartments would increase population density, strain city services and further crowd out families.

They are calling for a pilot project to test the new units before fully opening the door to construction.