You need to learn how to Google in English

http://lmgtfy.com/?q=security+deposit+separate+account

first link: http://www.landlord.com/security-deposit-law-guide.htm

If you want to stay in this rental unit, it is better for you to sign a lease for another year now (assuming your current lease expires in Feb). That way, no matter what happens to your landlord, you get to stay in the house per lease.

Think in this way, if you rented in an apartment building, whose owner was a corporation, you don't really care if the corporation is bankrupted or not. Because someone will be there collect the rent and repair the defects as required by lease. That's all you care about, same case here. Stop worry too much about who will own the house, as long as you have a lease, you are good.