Refer to the input text as context and select the correct relationship between 'Lyft' and 'SAN FRANCISCO' from the available options.
Options: owned by, distribution format, headquarters location, subsidiary

SAN FRANCISCO (Reuters) - The Massachusetts attorney general's office is examining how Uber and Lyft ensure equal access for people with disabilities, a spokeswoman for the attorney general told Reuters, adding to numerous other business issues facing the two companies.
headquarters location