You or someone else call insurance company and say your the owner and put me on as additional insured. That provision should be in lease agreement.
Just tell title co. or attorney what you want to happen and how. I would choose closing agent if I were you.
Other things?
audit the leases w/ an accountant shrewd in office condo leases
get inventory list and check it
get building and land inspectors
review all agreements
have a survey done
title search