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.

Personally, I want to inspect each property, check county records and ordinances, come to understand the neighborhood including economics, crime, taxes, etc.

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

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!!

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. 

Through your network, real estate meetups, and building real relationships.  

Starting out, I was pinching any penny I could, so would spend hours and hours measuring and building plans.