(I professionally flip houses, commerical property, and land.)1) Data.

@Bruny C. if you would like some more data or another opinion give us the actual value of the property and your amount of the current mortgage. 

So its not really in the city/county's best interest to approve plans for another mobile home park that will be sucking resources from the municipality and not putting much back into the pot in the form of property taxes collected. 

His wife collects things from estate sales and hoards it at this place.

When screening do not ever view a applicant as a person only facts and data.

You're renting by the month -- if you collect the "security deposit" by the month, it's really only "rent".

For $350k purchase you should technically collect $3500 in rent every month if you were to follow 1% rule.

They explained to us how they have paid for the property three times by the amount of income they have collected over time, but now just want to liquidate everything.

: Lower Your Small Business Taxes and Tax Savvy for Small Business: A Complete Tax Strategy Guide Twentieth Editionlegal and insurance - Every Landlord's Property Protection Guide: 10 Ways to Cut Your Risk Now (book w/ CD-Rom) and supplement with Every Landlord's Legal Guide (generally speaking Nolo has a good collection of books)property management - an excellent resource is The Book on Managing Rental Properties: A Proven System for Finding, Screening, and Managing Tenants With Fewer Headaches and Maximum Profitentity start and maintenace - Garrett Sutton's Start Your Own Corporation: Why the Rich Own Their Own Companies and Everyone Else Works for Them (Rich Dad Advisors)  and Run Your Own Corporation: How to Legally Operate and Properly Maintain Your Company Into the FutureAnd here is a set of questions to help you judge if you maintain your corporate well:How well have you separated yourself from your business?

I self-manage so don't know how the property management companies do it, but I don't collect the application fee until after they have seen the property and passed my pre-screening questions.