This area along the present Qiblah wall (with Bab-e-Salam in the background) is where the houses of Jafar (رضي الله عنه), Abbas (رضي الله عنه), Naufal bin Haris (رضي الله عنه), and Ammar bin Yasir (رضي الله عنه) were located at the time of the Prophet (ﷺ).
(more to follow)
References: History of Madinah Munawwarah – Dr. Muhammad Ilyas Abdul Ghani