Otherwise, a 30 day written notice of non-renewal delivered in the correct way should be sufficient to have the right to take back the property.

I already asked the bank if it could be delivered vacant but from how they responded I think they want to avoid that headache.

Have your attorney make it a condition of the contract that the seller deliver one unit empty for you to be able to occupy.

The actual rehab cost was $125,000, and we have delivered the property on time.

I've talked to the current PM, and while he's usually leery about managing non-conforming properties, he said the fact that the postal service didn't raise a red flag and is delivering to all four units is good enough for him that there'll be no issues with the county. 

Recently I've tried sending a certified letter (containing all my contact info and a request for contact) with return receipt, but USPS reports they were unable to deliver it  - Notice Left (No Authorized Recipient Available)There is nothing particularly wrong, and she's completely current with rent based on auto-payments.I feel uncomfortable not being able to reach her.

The property delivers an 8-10% annual cash on cash return and has ridden the recent market upswing and appreciated about 25-30% in value since purchase (March 2016). 

Landlord shall have the option to terminate and cancel the Amended Lease ("Landlord's Termination Option") by delivering to Tenant written notice of Landlord's exercise of Landlord's Termination Option (the "Termination Notice").

In this case, the fact that the bank was ready with their very specific title language as soon as the contract was delivered shows some evidence of knowledge they failed to disclose.  

Typically the agents agreement to the mls is that it doesn't get changed until it is ratified, which would mean that all the initials have to be signed and delivered.