I found a really nice brick building with 12 apartments, 3 commercial business units and some garages.

Bossier partner managed property and repairs while we managed business structure and banking account setup.

The side moral to this story - be in the plumbing business.

As for valuing the property, keep in mind that the properties are valued based on NOI, just like any business. 

Rents are sky high in certain neighborhoods of Jersey City (we are second to NYC) as such many of the tenants are professionals with high income commuting to their jobs in NYC by ferry, 24 hour path train and bus. I

Is it worth to invest and learn from their program in order to start my co-hosing STR side business just to get some extra money monthly?

If you own the business and the land, I would keep them together.

Quote from @Jaxin Pierce: I'm a self-starter entrepreneur who owns a vending machine business.

Little cabins have very little value.Maybe try for a commercial loan as a business?

Especially in the real estate rental sector, I like to say "Be polite through hospitality, but be harsh on Business"