Less to clean 😉 I say all of this to get to the point of, how would you guys go about asking someone if you could use their land to park your Tiny House?

You'll clean some garbage and you'll do a ton of grunt work.  

I had to clean up after the squatters and their dog nearly destroyed the property.

Jeff would likely know some in London.As far as using an out of town lawyer to sign docs, you can do that all through fax or docusign in most cases.Most lawyers will give you a tough time about answering questions and working with cleaning up drafts, as it is their business and they deal with tons of tire kickers.

I asked her to allow me to do open house but she says she'll have to clean the house etc. etc.

Account Closed water is included in HOA but yes I'm paying for electric. 

Not sure if I'm going to fix it up and sell retail, or get it cleaned out and sell it as is.  

(but looks like you would for first month)...so back to your situation, which is not clean, but check your state rules and verify without the signed lease, you reverted to the month to month, so I would really document and communicate the end of June move out date (like verbal plus a follow up more formal looking letter) and prepare for the move out then and the painters, etc to come in..

We had a contractor look at the property and it looks like the current owner was trying to make it into a duplex and made some changes with the plumbing and electric that were not permitted and from what he could tell not up to code.  

While it is great to be proactive, for a standard clean deal on a 1-4 unit property, you will probably be doing a standard homeowner type residential transaction, so you may not need much advice up front that (nothing you could not find online, like here on BP, or in books mentioned here and elsewhere).What would you ask them anyway?