1. Can I use a payment gateway component with this like Virtuemart or Redshop; so, pespective renters can pay their rent.?
Real estate manager has all features for build payment rent system, As example for every - who send rent request - you may send link for some product in Virtue mart, and after client pay - yopu will approve rent request.
If you need connect that semi automatically - you wil lneed build that self or writ custom component create request to OrdaSoft Support form
2. If a renterpulls up their account is it possible for them to view their account only? ie info and say pay history?
in Pro version - admin can configure realEstate manager - for possibility frontend users - manager self properies from frontend
Any payment option - require additional work
3. Can search function be closed; so, only a realtor can only see their assigned properties? with filtering via an extr field like in SOB?
Not full understand what you mean.
In Real estate manager - every realtor - can access and manage self properties from frontend (if admin permit that)
Self search - you may rebuild as you wish ,Or ask from us custom version