Google Fiber announced plans on Wednesday to offer Internet service in San Francisco apartments, condos, and affordable housing properties.

Instead of installing its own fiber cables, Google said it will use existing fiber, allowing it to bring service to the city more quickly. Google may need to do some work outside and inside buildings to connect properties to the existing fiber, but otherwise not much construction will be required.

This is similar to a deal Google announced with a city-owned utility in Huntsville, Alabama. But in the San Francisco case, Google is not saying what entity it is leasing or buying fiber from or when it will start offering service.

"We aren’t disclosing specific details about our agreement," Google told Ars. "We're just beginning to reach out to property managers and owners today, so we don't have details about specific properties or timeline." Google also did not say how many buildings in San Francisco will receive service.

Residents can go to the Google Fiber website to sign up to receive updates while property owners can fill out a form to express interest. Google Fiber's announcement said it intends to "serve a portion of San Francisco, complementing the City’s ongoing efforts to bring abundant, high-speed Internet to the City by the Bay."

Some affordable housing developments will be given Internet service for free.

Google also used existing fiber in parts of Atlanta, though the company's Atlanta deployment is mostly new construction. In Provo, Utah, Google purchased an existing network instead of building its own.

With the addition of San Francisco, there are now seven metro areas where Google Fiber plans to offer service in addition to the four where it already serves customers. Google Fiber lists another 11 metro areas as "potential" fiber cities. In most cities, Google says it is building fiber networks from scratch.

San Francisco is also slated to get a fiber-to-the-home deployment from AT&T.