There are several methods for determining what to pay, but generally speaking you will probably want to be getting your properties for about 65% of ARV.

What was your method of presenting your offer?

This is why people use the BRRRR method.  

However if you intend to acquire that equity stack from more than three or four people a syndication will likely be your best method.

I did the BRRRR method in it with my family (took me multiple years).

HELOCs are often time the cheapest method to tap into your equity. 

A Minneapolis lender, Pine Financial uses a 70% loan-to-ARV method, (for simplicity) if the projected value of the home after it is fixed up is $100k, they would lend 70% of that ($70k) for both acquisition and rehab.  

@Marcele Johnson there are two things to address here:  A 2nd FHA loan and the BRRRR method.2nd FHA Loan - now, FHA does allow you to have 2 FHA loans at once but there needs to be a reason according their own guidelines.You need to have a job transfer outside of your normal commuting area - usually 100 miles away or furtherYou need to have outgrown your current home.  

@Debbie Ough one of my colleagues sent me this. https://www.investopedia.com/r...Give me a shout if you have more specific questions. 

Right now we're dealing with virus uncertainty, but in the next 3-6 months we are dealing with economic unemployment and quite a few businesses won't make it out to the other end so keep looking at new, creative methods of financing.