Sorry for the questions, trying to understand third party software support needed

Given the current market, where it is hard enough to find a deal without a third party making money, I don't see how that would work.

The seller is no longer a party to the deed only the note.  

The next hard part is collecting. 

Also, the city's building code could be different as far as the required fire rating for party/shared walls, etc, thus the construction costs could be higher.

,Transitioning multiple units from one property management company to another can seem overwhelming, but with the right process in place, it can be smooth for all parties involved—owners, tenants, and both PMCs.

I would begin marketing immediately, and mention it will be ready the date that you have very high confidence it will be available.The harder part is being selective what you show. 

Thanks Matt, I forgot about take part. I

To make it easier on both parties, I would simply make the introduction and if they go under contract I will set up a referral fee with the property owner to pay me for the introduction. 

You have to use the services of an unrelated party called the qualified intermediary.