I have a coffee shop on Metrorail property and pay rent to Intersite Property Management. My lease contract came to an end in April and since then I have not recieved any accounts for rent. When I phone them they say there is no money outstanding on their computer. My buddy down the line has not had an account since December when his lease ended. Although I have put the money aside every month, my concern is this;

1) When they eventualy draw up a new agreement, do I have to pay interest?
2) If the new rent is too high for sustainment of the business, am I forced to pay this amount from April to now even if I close the shop?
3) If they want me out and have a BEE guy run it, do I still have to pay the rent outstanding?

If somebody knows answers or where I can get answers, please let me know.
Thank you