He's basically reneging on the financing.Worse still, I'd be shocked if, after this is all over, he'll be the least bit appreciative of the hard work you put in to get it done.If the roles were reversed and you needed him to eat 50% of the note value on a short sale, how hard would you expect him to be working to solve your problem?

You NEVER want to put all of your eggs in one basket so to speak.

@Marcus JohnsonThere are definitely some bad eggs out there that we've all read stories about.

If you still don't get anywhere, give up on getting anything from them and just eat the cost of the repair. 

Also, it is generally expected in MFs that the land lord provides basic amenities such as lawn care and water/sewer if the duplex is on master water meters, and those expenses eats into the monthly profits. 

Do not put all of your eggs in one basket. 

@Tucker Cummings the never ending chicken or the egg question. 

The IRS seems to try to box it in so folks can’t as easily have their cake and eat it too.

Here's some more reading material for you:https://www.biggerpockets.com/member-blogs/10850/74478-a-little-known-secret-called-self-directed-irahttps://www.biggerpockets.com/member-blogs/10850/76519-dont-put-all-eggs-in-one-baskethttps://www.biggerpockets.com/member-blogs/10850/81273-how-to-pay-less-in-taxes

However, the 1st property detailed above had been professionally managed for many, many years, was eat-off-the-floor level spotless clean in the basement and had clearly been well cared for and maintained when we bought.