They used the "Family Matters" set to film the pilot
Fans of the show have made their distaste for the NBC blockbuster comedy "Friends" clear on social media. They claim that "Friends" stole the central idea of "Living Single" and received a level of support (from both NBC-Warner Bros. and audiences) that wouldn't be given to a show with all African American leads but was certainly available for a show with six lead white actors.
On the first episode of Living Single, the living room looks strikingly similar to Family Matters