., tenants-in-common). 

There are two ways for multiple people to own a property1) Through an entity(LLC, LP, Corporation)2) As tenants in common(aka TIC)Situations get sticky when you have purchase done through one person but want to transfer it to an entity with multiple owners.

This is a fairly common theme in these groups, GC is bad, doesn’t show up, goes bad etc, and the investor is stuck with unfinished projects in various stages.

GRM is more commonly used for 1 to 4 unit residential properties compared to CAP rates which are for Commercial properties.

that said it's very unusual to nail down a place that will cash flow here, the more common scenario here is a significant chunk of your mortgage. 

My current primary has a 30'' wide back door **hint hint** that's not a common size.

This is just part of the 'cost of doing business' with those often very affordable contractor types...they're more commonly not able to manage the funding, but are good workers.

Although it seems a little dishonest and was once considered taboo, in this competitive market, it has become more common.

Doesn't mean it isn't common I have just not heard of it. 

This is far far more common than it is uncommon.