In general, if your existing three units are running well and you will cash flow nicely when you leave and there is limited cap ex, I would look into acquiring another property and leave the basement for storage, laundry.

The only way to use rentometer is to see what comps they are using and then you can make your own adjustments from there based on size, beds, baths, basement, garage other features and most importantly the condition. 

The downside is (1) compared with residential, comps used in appraisals are nowhere near as accurate, so the income approach is heavily relied on, which can produce huge swing in “valuation” depending on cap rates, interest rates, revenue swings, expense costs.

Those metrics are Cash flow, Cap Rate, and Cash on Cash Return.

I have had 1% rule 1 day bookings before and There are still some house with 10+ cap rate potential passively after our management.

For example, if you are looking to connect with other members near you, want to learn from people in a specific area you’d like to invest in, or have a desire to find people interested in certain topics, you could use the search feature here: https://www.biggerpockets.com/search/usersI really like the alerts feature that can quickly guide you to current topics that may be of interest: http://www.biggerpockets.com/alerts

Did not think of that. )Re-cap questions:(1) is it OK (acceptable), legally speaking, to send a notice letter to my tenants informing them of non-renewal when their lease is up?

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ADUs are usually capped in square footage and number of bedrooms.

There are a few self-contained guides that you can access here: https://www.biggerpockets.com/guidesI really like the alerts feature that can quickly guide you to current topics that might interest you: http://www.biggerpockets.com/alerts