Bluebird Motel
From Futurepedia, the Back to the Future Wiki
The Bluebird Motel was a motel on Main Street in Hill Valley, with an entrance located at Courthouse Square, adjacent to the Western Auto Parts store. By 1985, the motel was out of business and its green awnings had been torn, but the sign was still over the entrance. Another sign, advertising the motel, was where Emmett Brown decided to paint a starting line on the street indicating where the DeLorean time machine should start.
[edit] Behind the scenes
The location of the sign, lamppost, and tree that were seen can be found in Griffith Park, Los Angeles. The prop sign is since removed but the tree and lamppost remain.
