I'd recommend keeping them separate for that reason. 70% LTV should be doable as long as you qualify (LTV can be affected by your FICO scores).

Credit unions or smaller regional banks might be a better fit.

Quote from @Jason Bohling: @David M. unless it is with a portfolio lender which most credit unions and many local banks are.

Make sure you have the right property insurance while the property is being worked on and an investor friendly lender or local credit union can help you refinance or get a HELOC.To Your Success!

I believe up to close to 40% down with a 720 or greater credit score on a conventional loan product could give you the best interest rate. 

Some lenders do have minimum credit scores to access these loan types, but it is the exact same qualifications for income and assets as non renovation loans. 

On the north side, my credit score requirement is 680 and I strictly require their monthly household income to be 3x the rent.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

University federal credit union 

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?