Tenant’s that have signed lease extensions, but no original lease

[Steve Fey]

I just purchased my first triplex. The tenant on the 2nd floor has been there for 15 years. She signed a lease extension with the previous owner that guarantees her occupancy for the next 2 years at a fixed rent level of $1050. The only conditions specified in the extension are rent level and term... no other conditions listed.

Neither this tenant, nor the seller could produce an true/original lease agreement.... just the lease extension agreement.

Since there is no original documentation on conditions/rules for the property, what is enforceable?  Can I create a new lease agreement that spells out rules and conditions (while respecting current rent and term listed in the lease extension agreement).  Could I start charging additionally for things like off-street parking?

Furthermore- what if the tenant refuses to sign the new agreement with conditions, rules, and stipulations?