The landlord should be named on the tenant's insurance policy for additional protection and to assist with tracking compliance.

I am considering building up on my fourplex. 2 additional units.

Now they want to put the properties into RE Gain Fund, LLC UpREIT (which appears to have been established in 2023). 

Right now, homeowners across the country are seeing record amounts of equity.According to Intercontinental Exchange (ICE), the average homeowner with a mortgage has $319,000 in home equity.Why Have Homeowners Gained So Much Equity?

It is my understanding that the new owner will have the house at the cost basis of my purchase price, for calculating capital gains taxes or depreciation.For gift tax purposes for you - FMV.For capital gain tax purposes for the recipient - your original basis/purchase price 

Just one additional option.  

@Edgar Duarte Selling now under the primary residence exclusion avoids capital gains taxes, allowing you to reinvest the $500K equity in diversified assets like index funds or additional rental properties.

I would sell and take your gains.

Slow start but hoping to gain momentum.

Additionally, your brother would inherit your cost basis in the property, which could result in significant capital gains tax if he sells the property later.