First thing to consider is what was the original foundation design and can it hold a second story to a home.

My husband talked to his boss to see if he was interested on selling a small vacant house he owned, and we got it!

Once you find that company then you have to make sure that your business model aligns with theirs It is very important that you make sure you take the time to interview and have candid conversations with a PM company.

We have a duplex with an extra flagpole lot that we are hoping to set up with an ADU for short term rentals.

What do you want to be , a house flipper , or a landlord ?   

@Michael Plaks Honored to me mentioned by you, in such esteemed company!

I would like to learn more about seller financing, I see a lot of information on the internet about seller financing but honestly I am just confused.

You will be able to learn a lot from the forums and past posts.

Its a tiny loan for any institution.You'll have to get hard bids from a local GC, but maybe $110/ft?

At the end of the day, your servicer is there to keep your loan compliant and to process and apply payments.