In 30 years I had the Due on Sale called twice.

However expect it to be a real pain in the but and take multiple calls to get it resolved. 

In 2 years or whenever the market calls for selling; My partner gets his percentage of equity (downpayment) and i will get my percentage of rehab cost and equity paying down the mortgage.

When done and if it going to sit empty for a while, then there is the one in between (I think its called vacant building or somethign). 

This would all be in an effort to avoid excessive calls or people showing up to our showings that are not good renters.

There's LOTS of wanna be investors who start down the road, make a lot calls and take no action.

However if you are good at calling tons of people to try and get a deal then you might be able to make it work.

Peer Street struggled with Underwriting, collecting payments, and the math that an accounting firm calls audited while from the outside everything looked pretty. 

Call them up, ask to speak to their loan department and ask them what their appetite is for smaller commercial apartment buildings in the 6-8 unit range.Good luck.

This is called Primary Flipping.