If you hire another layer of management they are going to take their additional 10-15% for their time and expertise (although on a 10-15k rehab that isn’t much and probably worth it)We have clients do BRRRs often, but not in 90 days and they still have a few dollars let in the deal when said and done.

Quote from @William Whitley: I have an investor client that purchased an improved property for rental and it included an additional lot.

I selected his program after reviewing 2 additional mentor programs by Peter Harris and Tyler Cauble.

It took time to explain how this opportunity fits into our real estate model, but I was able to show how this was really a real state play that added an additional revenue stream while increasing the real estate value.

It will also depend on the lender - but gettin in the business to get forbearance to buy other properties is a slippery lsope to go down. no they wont excuse the payments they will just add it to your loan. as an extension of 31 years or so as an example. not gonna repeat this processes if i do end up doing it, if their a tool. why not use it

In addition, conventional refis are going to have to meet DTI guidelines using a global cash flow...so we're cash flowing your personal income, personal debt, other properties, etc in one Debt-to-Income Ratio.

There are other specifications (like how close to the lot line on all sides, etc), but the point is, it can be done.So, I would focus my search on properties with the lot size, shape and placement of existing home that allow for additional ADU placement. 

If you’re thinking about building one at your own home, your best next step is to look directly at the updated zoning text on the Columbus city website or contact the zoning department so you can see how your specific parcel is classified and what is now allowed by right versus what would still require additional review.

What do you mean by the additional $18/sq design fee was not included? 

What you are proposing would be a textbook example of the legal doctrine known as an alter ego.