In normal times i would think selling is typically the smarter financial choice, but at the current time keeping may have a significant finance (due to low interest rate) advantage.Here is a list of why adding ADUs 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.

The ones that truly understand it often don't want to be bothered, so, slightly back to one, are assuming that any outreach is bad news, otherwise, let it go.Everyone's preferences are different, but I found sending out a semi-generic email with a link to schedule time with me was the best way to reach the most people, and people that wanted to talk without making them assume something bad was happening.  

And YES, far FAR too often I am seeing people stack up UN-realized expenses at a compounding rate, to give selves a false sense of "profit" on whatever monthly/quarterly capital there moving around. 

It also matters where the home is located, and what the weather, type of tenants it attracts/has been attracting, etc. other factors are.

I do require full screening for the incoming tenant, and updated income screening for the full group of tenants.

What kind of tenants do you have?

Generating equity is often second to that.

So, often times they don't tell you they are wholesalers and act as if they plan to purchase the property themselves. 

Warranties often have limitations, like they might not cover pre-existing issues, and there could be delays if they require you to use their contractors.I'm not sure if you've purchased a warranty already, but before purchasing a warranty, it’s a good idea to carefully read the fine print to see what’s covered and if there are any exclusions.

Ok, if it's still sounding do-able, the next issue is that section 179 can't be used to create a business loss, so it would only reduce your taxes for the year if your rentals are operating as a taxable gain (but rentals are often at a tax loss thanks to depreciation).