This is a picture of the cluster of buildings destroyed, posted yesterday in L'orientlejour.
Apart from the synagogue, the three residential building are of a common charcter found all over the place in Beirut, and buildings from that period are not an uncommon sight although they are getting rare. From what i an tell from the pictures, i find it pretty hard to restore those buildings.
However, Bernard Khoury, (architect who designed B018, Centrale, Yabani and other buildings) had a clever solution for his "Centrale" building straight out of the textbooks of Solidere where if any building from that period that is in danger of collapse and that the owner wants to preserve, a metallic structure should be fixed on its facades as a structural reinforcement. Here's the result:
Solidere probably owns those buildings and the lot on which they were built so it's pretty logical for them to "clean" the lot and build more square meters.