Unknown maybe multi family or airbnb (depends how 2 & 3 are doing) I'm hoping to do all of this a few months apart and using all the revenue from the sale of my house.

Yes but be careful of all the necessary costs (unneeded upgrades) and unknown costs.

Also, don't expect to be pocketing money at the end of the month because what little cash flow you have will go into an account for repairs/maintenance/vacancy/unknowns.

I wouldn’t let any unknown, like an election, slow you down for the next 10 months.

@Ben Sears gave you great advice.Still a lot of unknowns obviously.

The additional costs not factored include: adding electricity to the additional 5 units, paving the driveways (would use either limestone or asphalt), and then the biggest expense and unknown would be bringing in the additional mobile homes.

MY SOURCES:SHORT VERSION ON CHINA:Information out of China on the CoronaVirus Can't be Trusted, so there is a huge amount of unknowns.

The thought is I could keep the same good tenant instead of gambling on an unknown tenant, the tenant gets continuity to their business instead of finding a new place for likely similar rent, and I get to increase my NOI for sale or refinance purposes.

At that time you'd be claiming full title via, adverse possession against any unknown heirs, who may have retained legal interest in the property as a result of it not having gone through probate.https://www.legis.state.pa.us/cfdocs/legis/LI/consCheck.cfm?

I know I can make it work and I'm good with numbers and not letting emotions get me when looking at a place (though a good historic house does tug my heartstrings), but I'd be lying if I didn't admit that I'm nervous about still making a big mistake on my first house and all the "unknowns" of real estate that are only gained with experience.