It depends on the loan program  and how you will be on the loan/title as a co-borrower. 

And you can check out StoreLocal, which is a co-op that helps members with marketing, legal, etc. 

This was originally going to be a rental but the sales price was solid for what I had invested in it and I have a few other projects I'm interested in moving on to.This was a South Beach studio that I picked up December 30th and did a full gut rehab.Purchase price: 60KRehab 25KSale Price 130KFirst time flipping a condo and a co op at that so I learned a few things but overall a solid experience.

Does anyone know of any resources where I can find a co-investor to develop the Northern lot along side me?

I was not interested in being a co-borrower. 

My question was should I be concerned about the home not having a CO or permit on the extension which was done over 50 years ago most likely and before this current owner bought the home.The rehab I’m estimating at 100-120k.

I would also suggest a co-signer, should be low risk for them since money is paid up front they are just guaranteeing she will pay or leave in a year.  

Should I try to find a co-signer?

FHA PMI will always be 85 basis points with 3.5% down under a $625k loan.Conventional PMI is based off of the LTV, the borrower''s credit score, if there is a co-borrower, if the borrower is a first time home-buyer, property type.

I've also considered splitting spaces into more of a co-working space setup.