But hes cosign with his fiancee who is pregnant.

The pregnant one will often stock up on calories and go laterally 30 feet or so looking for a new food source for her spawn, potentially infecting a neighboring unit.When I was an undergrad, I inherited bed bugs from a previous tenant.

The bank is paid off or paid down and you assume the rest of the loan, and voila' you get title to the new property (or the LLC that owned the property).These were done for decades (boring but crazy fact - they used to be called Rutherford Exchanges and the original case if I remember was the sale of some pregnant cows with payment being their offspring when born). 

Tenants got pregnant,  they had to leave when lease was up  cause baby makes three.  

When my wife was pregnant in the summer and had the baby and stayed home that summer , I had the electric bill from HELL .

She continued to say that the girl that was buying this house was a single pregnant woman and she didn't have anyone to fix these things, so we better take care of it.

At the beginning of the year my wife told me she was pregnant with our second boy.

that 100k will be our down payment for our next home which will place our next home's budget within the 350-400k sale price...the X factor is my wife is pregnant with our second child. 

However, the wife is pregnant and due at the end of the lease; I can’t imagine they would want to move at that time!

The seller hopes the buyer (gets pregnant) on the deal with tens of thousands of dollars spent or more and also if they have a 1031 exchange they can now be stuck with the choice or face a big tax penalty.If a seller does not have a full file ready to go the minute they go under contract then either the seller, the listing broker, or both are incompetent or they are trying to hide something  and commit unfair dealings by pulling one over on a buyer.