|Prue and Piper Halliwell's Apartment|
As young adults, Prue and Piper Halliwell shared an apartment in North Beach. They moved back into the Halliwell Manor when their Grams became unhealthy. Prue and Piper allowed friends of their's to take over the apartment and live there.
A couple of years later, Piper told Leo that those friends were moving out the apartment and wanted them to move back in there. Eventually they didn't move and the apartment was presumably sold to someone else.