However since I will likely have to use a commercial or portfolio loan (I want a cash out refi or credit line secured by the property/business, I am of course willing to personally guarantee) I think it is reasonable for the underwriter to appraise the property taking into consideration cap rates/business income to derive the value.

I work in a marketplace now that competitively derives fixed, annual, guaranteed offers, and right now, we have over 300 management companies that we work with.It's free for homeowners, so if you'd want to hear an offer, I'd be happy to chat and see if we could get one for you.

SAAS solution where they derive fees from promoters for listing deals on the site.

That also means, you cannot be related in any way with the broker, title company employees, owner of property (including yourself), lawyer, seller, etc.All monies for purchase and closing must be derived from the you IRA.

I use a discounted cash flow model to derive the return estimates in the image below, see Returns Summary section on the left side of the image.

That contribution could be derived from cash, a rolled in acquisition fee, or a contribution from a member of the GP that is more of a strategic capital partner providing a co-investment and perhaps a balance sheet/guarantee. 

This is a TAX SAVINGS entity for income derived from active pursuits--bird dogging, wholesaling, flipping, real estate commissions, contractor work, etc.

The RTO operation might have gone unnoticed if it were not for consumer complaints that derived from other aspects of how the company operated.

It is a personal home that you and your family will probably derive a lot of pleasure from.Also, you may want to do some digging as to why they are offering discounts, upgrades, closing costs, and a TV.  

For a SFR, you are  using a variety of data sources to get the comps for an area (such as market price per sqft) but with a multifamily, you are not necessarily looking at price per sqft  or "like" properties per se, rather you initially have to determine the rental price & cash flow per unit from which you can then work backwards to ascertain or derive value.Also, unless you have a property under contract, the opposite of attention is what you are typically looking for in regards any deal so you may want to learn as much about ARVs as you can -- fast!