Maya's property, I believe, is her grandfather's property. That safeguard, put in her by grand father, ensured Ashwin had to tolerate her till she reached adulthood.
They've never quite explained Maya's sach, but there was a dialogue in the papers just prior to the time it was supposed to wrap up (the time when Maya went to prison), which said Maya had assaulted/killed a schoolmate of hers as a kid.