They are using rules to add multiple ADUs.Here is a list of why adding a single ADU in dingle family  zoned areas in my CA market is typically a poor RE investment:1) The value added by the ADU addition is often significantly less than the cost of adding the ADU.

I will summarise my learnings to date and share a little about the process/rules I have developed here to hopefully be successful in REI in the Portuguese market.

You’ll want to get really familiar with local zoning laws, short-term rental rules, and landlord-tenant laws as they vary by town if you plan on going the STR route.Focus on Cash Flow Early On: You might be tempted to go for something that appreciates quickly, but in the early stages, it’s important to find properties that bring in cash flow.

These methods include: Detailed Engineering Cost ApproachDetailed Engineering Cost Estimate ApproachSurvey or Letter ApproachResidual Estimation ApproachSampling or Modeling ApproachExperience or “Rule of Thumb” ApproachIt’s important to understand the differences between the approaches including which one best fits your property and the reliability of each approach.DETAILED ENGINEERING COST APPROACHThis approach compiles the costs from construction and accounting reports to build a report.

With the new commission rules you can stay flexible with an offer of buyer agent commission, rather than having to commit to a certain percentage going to the buyer agent upfront. 

I had to spend a few days backlogging two months' worth of data, that's until I set up the automated rules.

Ask the city/county for their STR rules.

A friend of mine in San Antonio had a similar situation.. she inherited a vague commercial lease and learned that the rules differ big-tiime from residential.

  #1 rule is not to trust them, but they still have value. 

It is investment banking, so the rules are much different than your "normal" lenders who offer mortgages or loans to cover a single or portfolio of collateral.