Lets say you buy a house with a solar sytem installed that is 5 years old. Why would you assume the old lease and not negotiate a new lease based on the simple fact that the solar system you are assuming has now been depreciated 25% based on a 20 year life span so instead of making payments on a system that was originally valued at 10,000$, the new owner should now negotiate a payment based on a system that has a value of $7500. How does this work. Has anyone recently bought a house with a solar system installed?
Tenants may be difficult to remove because of housing protections, but leased equipment is the responsibility of the lessee, and if you don't want it, or if the lessor is not willing to renegotiate with terms that are acceptable to the new owner, you can order them to remove it, or it becomes abandoned. There should be some paragraph in the lease that addresses this, so you need to have an attorney review it. But either way, since you did not sign the lease, you can't be forces to assume its responsibilities.