The good thing about fear is that it typically prevents one from entering into a dangerous situation.

So, what @Jessica Zolotorofe said, get out the operating agreement.You may find that you cannot prevent the sale and 1031 but using 1031 creatively you may be able to craft an exit from the subsequent purchase.

The limit on rehab dollars borrowed is set at 50% of whatever the Appraiser has found the finished value to be to prevent over improvement  of the property.

Maybe you did and the inspector missed it too, that happens unfortunately but it helps prevent stupid mistakes like this more often than not.Things will happen, even good subs will screw things up at times.

However "keyless" deadbolt or other approve devices that prevent entry from the exterior without a key are required on all exterior doors including a garage

It's these little details (I'm dead serious about the elementary school kid-style stars) that can prevent delayed closings, and let you close on time or weeks early (that can  be a deal maker/breaker with a distressed seller facing foreclosure etc). 

You have a potential income from a tenant, with a desire to buy more, but you're doing everything possible to prevent that from happening:1 - 15 year mortgage2 - paying extra on principle to pay off loan soonerYour role in REI is to spend as little as possible, to keep as much cash moving through the system...under your control.Your tenant's role, is to payoff your properties (with profits/cash flow to you).  

Any suggestions on how you prevent this from happening?

Allowing pets has also led to some significant mishaps and disturbances.Best remedy for preventing cats from pooping in the flower beds: lay down chicken wire under the top dressing... cats will scratch once and leave it alone, as it catches their claws, but doesn't hurt them.

Prevention goes a long way.