The Four Graves of the Prophet's Assalam

In the caliphate of Alwaleed ibn Abdul Malik who ruled from 88 to 91 Hijra, he decided to expand the Masjid in all four directions. This raised a huge problem because to the east, to the east are the houses of the wives of the process, still standing for 90 years. So we say Allahu alaam will be the case or not. But there are sources in our own books, including Khatab as now the snad is not fully authentic.