The basement of the Hayward Hotel (at the corner of Spring and 6th streets in downtown Los Angeles) had sat dormant and untouched for over 40 years before the team behind the newly opened Rhythm Room took over the space in 2015.
Source: Photos: Rhythm Room Brings Old-School Speakeasy Charm To Downtown : LAist
Click above for a very nice article from LAist (with some cool pictures) about the rebirth of The Rhythm Room, an old downtown LA speakeasy.