I have seen them fail as stated and cause some very major issues for TK companies who relied on those policies for their buyers. 

Additionally might say tenant required to keep an HVAC service contract.If unit wasn't serviced properly and now needs to be replaced instead of repaired then landlord might could argue tenant caused it to fail so is responsible. 

While it might feel like a big cost, failing to stay on the right side of the law will bite you later.

Would I fail?

I suggest if all else fails, have a weekly meeting where you look over the books together. 

Never fails.

I guess I'm asking how do I protect us from a failed project?

This in bathroom ( there is no exhaust fanI have section 8 tenant 80 years old (does not speak English) tenant family helps her.Tenant has been renting last 5 years housing authority inspection never failed before.

If the seller agrees to assign subject to its "reasonable" agreement and fails to do so, the buyer has the seller over a barrel which leaves the buyer claiming the seller to be unreasonable.It is much better to get all of this sorted out up front by writing a contract that fully spells out the parties intent and understanding if "and or assigns" is included in the contract.

I wasn’t going to fail, I wouldn’t allow it.