I have read most of Grant's book, love his aggressive style, but I have not gone through any of his courses, the price point was a turn off for me.

The less invasive option would be propane fired Rinnai style direct vent heaters in each unit.

The smoked residue of cloth wire wrap was also evident in the majority.My son had college friends renting a 3 unit (12 occupants) on a single 60amp screw in fuse panel.

Length of tenancy depends on the property, the type of tenant, and your management style.

If it were me in the situation I would look either at the most doors I could get for the buck in a stable market, like a $750,000 16-unit multi-family in my market that is currently c-class (window unit air conditioners, dated stylings, and 10+ year old appliances, etc), extremely well located, and, based on all that, probably a good target for adding value over time and increasing the appraisal value substantially. 

I have mine.. it was not until my dad Found real Estate sales in the mid 60s that we got out of renting apartments and driving that old mid 50s VW with no back seats.. and my mom making my clothes.. 

For kitchen cabinets, depending on the style, new hardware can do a lot. 

If you can, use Fannie Mae Home Style Renovation loan. 

As such, we used our social media platforms to promote our newfound business of selecting different styles and matching them together to form a cohesive look for others.

For those playing in San Francisco, here's an scenario about the potential upside coming...https://www.nytimes.com/2019/03/07/style/uber-ipo-san-francisco-rich.html