I did not want to spend 50K on doing separate meters for where I have my rentals it would cost me this much.

No, we can do everything ourselves and not spend more money than we have to.

I just meant to say that it's our next goal to build that up, having just gone on a spending spree on fixing up both properties in a short period of time.

I am interested in utilizing space again for group meetings, workshops, and for clients who may still desire private space.

to simplify, here's what i would do: don't borrow private money, or partner, until you have a track record. 

I bought this property with a private interest free loan from a friend. the person i bought it from need cash fast so i offered them a low cash offer and they accepted.I had enough money saved up to rehab the house with my savings.

As I transition the property to a duplex + 2 ADUs, I am considering spending $10K+ to get another master meter put in.

I grew up around a “grind” mentality, and my family members seemed to spend all the money they made.

Sometimes people get paid and if they can pay their rent immediately they will but if they can't they may be tempted to spend it elsewhere. 

And you use a cleaning lady who spends 5 hours to reset the property for the next guest.