Wholesale, ho-tail, or retail, the issue is to determine the status of title and what is required to pass title to another.The secondary problem is control; how do you control a property that someone may not own?

Initially I was going to use quick books but have read about a few programs tailored to rentals.

Do you know of a bookkeeping program tailored for real estate, specifically for flipping and for investment properties/rentals?

If you do design build with someone you trust, you'll have more control over the process and have greater cost certainty earlier on in the process and you can then tailor the design to your desired budget.

You can tailor this number to meet your needs and goals as well.My train of though on this is just because one rent may be higher than the other, a proportional amount should be put towards CapEx reserves for each property.

Do you tailor the space to a particular type of business or do you rehab it so that it is more or less a blank canvass? 

As long as the numbers and sale price work for both the seller and the investor (me), I tailor the transaction process to serve their needs...and at the end of the day almost every one of them is grateful to me for doing so. 

It means that they can't be successful by trying to tailor their business owner by owner. 

Consult a financial advisor, real estate agent, or investment advisor for tailored advice based on your unique financial circumstances and objectives.There is no one-size-fits-all solution.

Without knowing more about your personal financial situation, it is a little tricky to give tailored advice.