There will certainly be buyers interested in having an ADU but I'm not sure they will be able to pay for the cost the original owner incurred to get the ADU.

You'll have to balance cost vs features!

Targeting, impressions, reach have been successful with Cost Per Results.

The cost of QuickBooks online doesn't justify our usage.

Some people are not ok with this.To get started in notes, there is a learning curve and upfront costs.

A lot of these blogs I am reading are from out of state with very low cost of living so I think If someone from this area could answer this, it would be very helpful for me.So my husband and I are currently living in one unit for the past 4 years that is part of a triplex/multifamily property in Belmont Heights in Long Beach, Ca.

Key factors in analyzing a multifamily deal: The two most sensitive inputs will be your vacancy factor and your cost of capital.

Depending on purchase price, cost of rehab, ARV, and rent in that area; you could potentially pull all or some of your money out of the property.

You have to get someone to walk it, give you a reno cost, then inspection and appraisal , takes time, Good luck 

Legal remedies can get costly.