I think you may just have been talking with someone with a poor grasp of prepositions.Here's a quick bit on townhouse firewalls: http://www.inman.com/2013/01/29/is-your-townhomes-firewall-code/I'm no expert, but I don't think this would be an expensive or complicated thing to address. 

If you are ever in the twin cities and want to meet up for coffee to discuss real estate, send me a PM. 

With some basic understanding of investment principles you should be able to discern over the course of a cup of coffee or a beer whether an agent is on the same page as you and has helpful information to share.

I have found him to be an upstanding guy, someone who knows the what he's doing and doesn't mind sharing that with others.

Pm me with your contact info, we could grab coffee and see what deals we can make happen.

Let me know if there's anything I can help with, or if you just want to grab some coffee and talk real estate.

It could be an LLC, trusts, S-Corp or other.As for the extra land and RV park plans, be sure to do tons of due diligence with the local permitting authorities to make sure you can do this and what the rules are.  

I'm in a perfect position to sale (tenant damaged house, insurance claim, ... the whole nine yard, and insurance pay for me to remodel the house - long story, let's get coffee or lunch sometime, my treat, and I can share with you the whole experience).

Lastly, can it be an occupation that can be worked part-time (hate to give up a paying job to get my feet wet)?

If you can get $700k for a new house that would be an OK tear down.