I don't know what labor cost is alone on a full build as I've never done a labor only build.

If you are planning to spend time in any of the units during the first year the best thing to do would be to communicate to the lender that the building will be occupied as both a primary and secondary property by the owners. 

If it either ages in a worse shape than it is now or I get ready to sell the building I will have to do something else.

Others build their own using Boostly or another similar company due to the same concerns you mentioned.

I was even denied the records for this house such as building permits, add on history etc at city hall even though it's public record knowledge!!

Just be aware of potential special assessments that may be in the works or could potentially come about, and factor in continued increases to the monthly COA fee.

At the end of the day, as long as you have the zoning you just need to go talk to your city planning/building department and tell them what you want to do.

This stability can provide predictable energy costs for your properties.Environmental Benefits: Utilizing solar energy reduces your properties' carbon footprint, contributing to sustainability goals and potentially enhancing the appeal of your buildings to environmentally-conscious tenants.Regulatory and Permitting Considerations: Make sure you understand the local regulations and permitting requirements for installing solar panels on multi-family properties in New Jersey.

I’d try to build relationships with the people first, if they aren’t looking to build relationships than they likely aren’t going to serve you well anyway and there’s no need to be on their list.

Those all probably have a higher ROI for you.If you really want to get to financial freedom, keep building your passive income streams.