Guy Bechor has an article - here in Hebrew - on Jewish landholdings in the Golan Heights/Syria from the renewal of Zionist redemption of the land activity:-
The green illustrates areas of Jewish development and in the next map, I've added the English names:
In 1891, 25,000 dunams were purchased there. Within a half a year, another 25,000.
According to the sources, including this book and others, upwards of 100,000 dunams (25,000 acres) of Jewish legally registered property exists in Syria.
Here's a book which is one source in English:-
If Syria ever becomes free, let's hope for genuine coexistence.