Ain el Mreisseh Mosque was built in 1887 by Hajj Abdallah Al-Bayham and his brothers. The mosque was rebuilt in 1951 and later renovated between years 1989-1993 while preserving its architecture.
Source: https://mapio.net/images-p/27571538.jpg
The AUB Archaeological Museum, founded in 1868, is the third oldest museum in the Near East, after Cairo and Constantinople. The Museum was renovated in 1999 and reopened to the public in 2006.
Source: https://www.lebanontraveler.com/en/magazine/lebanon-museums/
This palace is located on Omar Daouk Street.
Source: https://www.facebook.com/BeirutHeritage/photos/1570090709961326
"Fakhoura" area in Ain el Mreisseh includes a traditional house that was recently renovated.
Source (renovated building): https://www.facebook.com/photo?fbid=10217102877139884&set=g.2528041071
Youssef Iskandarani's house, located in the middle of Georges Post Street, was built in 1870.
Source: https://www.facebook.com/photo?fbid=10215745050955078&set=g.2528041071
Qaddoura Building, a traditional villa in Ain el Mreisseh, was turned into Casablanca restaurant.
Source: Owner of the libguide
Quo Vadis, an Italian restaurant once famous for its pasta on Phoenicia Street, has been derelict for years.
Source: https://3.bp.blogspot.com/-S5L3VREk0Q8/U0bRxAF9hHI/AAAAAAAAIW0/AZ44z-tbrTY/s1600/024.JPG
Mohamad Ayass Senno's house is a beautiful brick house built in 1865. The house faces Ain el Mreisseh stairs on John Kennedy Street.
Source: Mike Awwad's book "بيروت بالقلب" (Bayrūt bel-qalb)