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With the storage units being a retail environment I have a good idea how to valuate that side of the property, but not sure what to add in for the house.

If you are looking to sell pretty houses to primarily retail buyers, I'm not in a great position to offer you advice.I have worked with professionals that drive fancy cars and flaunt them, but they don't have a clue what they need to do as a professional.  

For 20+ years, I've operated and consulted with businesses in both Carolinas, New York, Nevada, and California, working primarily in the fields of hospitality, retail, food & beverage, and IT.

Occupants is a little trickier but you should be able to get that from the city water department.

You removed about $800 of our materials from our job site. we intend to report this as a crime to our police department and press charges against you at the close of business today. 

Bureaucracy, especially in government departments, which slows vital business processes.

Buying lists from listsource doesn't make as much sense to me since a lot of the absentee or high equity owner occupants could have houses that are updated and in retail ready shape. 

Take a look at the budget for a commercial airport, from the city aviation department, or port authority, or whoever runs it. 

Not sure you will know very much in this department.. but what if I want to place more than one mobile home on my piece of land?