I used to run a national mortgage company and had an investment firm in CA working on solely residential property in different locations and the got into multifamily acquisitions starting in 2018. 

I'm a NC/SC Residential and Commercial Investment Agent local to Charlotte.

Most agents (like 98%) know almost nothing about residential rentals.

I use a smallish local bank (about 30 branches) and have a great relationship with the VP in charge of residential loans and the VP in charge of commercial loans.

NOTE; This is skewed as I don’t look at any notes that won’t yield at least 12% at offered pricing, I don’t look at any residential notes, only commercial, and no notes under $500,000 principal balance, so most notes are eliminated before hand. 

He was the lead attorney for the National Association of Residential Property Managers and really knows his stuff.

A small benefit could be the quads being purchased with traditional residential lending where as the 16 unit would require commercial lending.  

In my case, I have residential rentals in one LLC, commercial properties in another, self storage in a third, and my real estate company operates in a fourth.

At least with residential Multifamily your building is more likely to increase in value again.  

I looked at the "Find a Lender" here but looks like most lenders listed are active in residential RE.