Feel like a good investment for 750sf? Since the surrounding area also can rent 3500 to 4000 per month

if decent furnishing might be ok, depends on how decent it is

but it won't be sustainable  because it is 4 rooms 2 bathrooms right?
wanna make a partition summore becomes 5 rooms, means except master room there are 4 rooms share 1 bathroom

you will be headache and tenants keep on changing every 1 to 2 months

Yea to make a 5 bed place out of a 1k sqft place is unimaginable to me unless you really have no budget. There is enough choice out there that you can live in comfort for 50 or 100 more. This points to student accomodation or foreign workers. No offence.