Indeed it depends on personal matters. My view is based on that my OH owns an apartment right across the road to the new development and has no reason to sell soon. We have visited and stayed there many times in 15 years and my impression was although a fairly nice mostly residential area it didn’t stood out. Actually that large empty lot next to it seemed more like a downgrade of the area. Now with this huge project finally happening I am really interested how it will affect the surrounding area. At least it will become a new landmark of SD Este.The question comes down to ...how urgent is getting the proceeds from a sale? Does he wait and loose current income ? Personal matters. Depends on OP circumstances..
Best of luck.
So I think the best is to wait and see what happens if you have the time.
For some indication of asking prices in the area one can look up the current listings at Corotos and Mercadolibre.