Give them 24 hours to pay the security deposit and sign the lease.

It does not provide banking accounts for deposits/and to keep units separate. 

This is a general question for security deposit deductions made by a landlord of a complex.

Do you roll the deposit over for the tenant that renewed?

That being said, I read some (old) reviews that said payments had been hung up (withdrawn from the tenant but not deposited into the landlords bank account longer than 10 days) and customer support was ZERO and their 'ticket' program kept automatically closing out the ticket request without resolution.

A double security deposit can. 

If have inquiry from Furnished Finder, I have an email ready to send them with next steps, usually with background check and information to send deposit, first months rent, etc. and once they agree, i'll send them the door codes.

As for the security deposit, it will depend on the title that it was collected under, security deposit or advanced rent.

I've seen people ask for bank statements verifying rent deposits (not always easy to get from sellers).  

I called VRBO customer service and was told, "Well, you have a security deposit.