Single family BRRRR is a different beast than 5+ unit commercial deals where there's more moving parts.It's common to waive inspection on single family that you buy cash but not so much on apartment buildings.

I noticed you have a common thread here, as in "...the fault of the owner (tenant)...".Trouble is, it's not the pet you rent to...the lease is signed by the tenant.

The most common updates, just to modernize, are bathrooms and kitchens. 

@Josh BanksA few common picks are Rich Dad Poor Dad by Robert Kiyosaki and Millionaire Real Estate Investor by Gary Keller and team.

Some lenders may do up to 85%, not as common, due to the epidemic but I would ask around and see what lenders in your area are offering.

Multis / rentals are not common, and in demand.

Which in my younger days was the common way to start up in RE if you had no cash and no rich uncle.

. - In expensive areas, it is fairly common to house hack on the first property. 

Any common demographics you've experienced?

Actually its quite common in the portfolio lending arena.