I would say, think in terms of systems and processes.  

We eventually paid $60,000 to install a supplemental AC system just for our suite.As a property manager I love it.

I would caution that whatever route you take, be consistent to each and every tenant because if you say one thing but do 2 or 3 things, courts will not look positively at you for inconsistent practices.If/when you need to find new tenants, be sure to have your own application, use the GBREB forms, and I've used the smartmove background/credit check online system multiple times with much success.BTW, you will find multiple opinions of what to do or not do... neither is right or wrong, everyone has their own system that works for them, so you will need to make that choice on your own.  

I have a lot to learn and explore. 

My believe is that there will be no retirement system available by the time we get to "retirement."

We buy properties with major systems in fairly good condition so very little capex so far.  

@Hattie Dizmond thank you for your comment, I might overestimated "turn keys" system and should try to build my team myself

Please let us know if you would like us to consider this as we have an older system that is not user friendly, and we would expect that it would require a number of programming hours and quality control hours to develop."

Getting through the learning curves, while making a predictable systems for someone else to follow.

(not interested in maybes or hypothetical guesses)Reason being - New Jersey is loaded with oil tanks and a septic system is not uncommon.