Sounds like a coop. There are some specialty lenders, such as Vancouver's VanCity that lend on coops. That may exist in Ontario too. Ask some other unit owners or credit unions. Another similarity would be mobile homes placed on a mobile home park ( we own a few ) with a monthly pad lease. You can borrow against those too.
The cheapest is likely a line of credit against another asset, like your home, as a lease-attached loan is more like a mobile home chattel mortgage ie higher interest rates, say 6%+ and shorter amortization, say 15 years.