Don't focus on a "rule of thumb" as a rookie.

It requires using a home automation platform (I use hubitat), creating an API, and creating some rules within the automation platform. 

If you'd like our "Keep or Sell" spreadsheet, email me at [email protected], but I think that you'll have to be very aggressive with your assumptions around rent growth and price appreciation in order to justify keeping this property. 

The FHA rules/regs (in particular the FHA self-sufficiency test) are applied the same across all markets, and I know for a fact that in rural communities across the country, and big cities that are not particularly desirable places to live, it's not a deal-breaker, I am not commenting on those areas. 

Consider the "2 of the last 5 year rule" to avoid capital gains.

Make sure your listing clearly outlines your screening criteria as well as your "house rules" if you're renting out a single room in your home.

With the economy of scale in multifamily, each additional unit nets you a little more than the last, as a rule of thumb.

Sharing understandings and rules on guests, cleanliness, chores, pets, drinking, drugs, boundaries, house identity, conflict resolution, communication platforms, etc.

For existing properties, you must make substantial improvements (equal to the property’s value, excluding land) within 30 months.Ensure the duplex qualifies as an OZ investment and complies with QOF rules.

Asking in the correct forum will get a better response.Read the RULES!