To qualify for financing, the condo must be eligible under Freddie Mac or Fannie May.
A lease purchase is truly only a lease with an option to purchase at the end of the lease term, which would then be negotiated at that current market value, not the current market value.
An option may be for a Bond for Deed, if you, as the Buyer, would have money for a downpayment.
All terms in a Bond for Deed are agreed upon between the parties.
Hope this helps.