The plan is to create an Excel sheet where I could plug the basics into a formula and it would give me a side-by-side view of how the investment looks with each fund option. 

I've got a friend who has spent a few years doing value add multifamily and now has a couple of bigger deals lined up, but can't figure out how to find the investors to fund them. 

Basically, 24 different properties spread across 3 Florida counties will need to close all at once during one closing.My thought is to do a quasi-double close/bridge loan where I bring in a partner to fund the deal (about $5 million), and then have separate closings as quickly as possible after the fact in which we sell the other properties we don't want. 

Duane, I personally do not like to finance an entire deal, for that matter I like to have a very low debt ratio.

You have to realize that real estate is cyclic.  3-5 years ago it was at a low for prices and interest rates.  

Problem is - the seller needs the cash to satisfy the mortgage + have funds to move to a new house.

What are you working with as far as funding? 

What can I expect when getting funding from a bank on something like this?

I'm considering them for a HELOC to help fund my first deal.

This will help you separate your property's funds from personal funds.