Even if buying at 2.5m still better then paying 20k a month over 10 years. There are many condos for sale but usually terrible juristic and owners. Just research and pick a good complex , and area , you can’t lose. Personally I prefer the older buildings compared to new off the plan condos .
my understanding is 180 on arrival as per passport stamp. Can extend once for another 180 days in country. After which you must leave and re-enter for the next 180 days to start