I put in lease that I must be present for installation and they can be charged for damages to property.

With my residential rentals I always charge more for a month to month lease.

Find a small remediation company to do the demo and mold remediation only and they will do it for you at a fraction of what they would charge insurance companies.

If there was a set fee charged to come out and repair a main line sewer clog, we may have gone that route.  

@Wayne Brooks  Out our way Attorneys are last resort.. this person would be best served to simply go to the title and escrow company and sit down with the escrow officer and title officer and walk through the transaction it will be free and they will know as much if not more than any attorney who would have to charge billable hours to get up to speedIn these little SFR transactions very few folks use attorneys for title issues ... they use them for contracts and other issues. but title companies here are the ones you deal with when it comes to these pedestrian liens and encumbrances.

I remember  reading something about making a deal with a seller and charging them a application fee or deposit but I can't remeber.  

I have had several tenants show me a credit report on their phone from a company that I cannot remember the name of at the moment.We prefer to run my own background check & charge the application fee to cover the background check & the cost of our time. 

You're either" acting agent for " and have a fiduciary duty to do the best job representing that seller to get the best price, or you're not acting as a fiduciary and you're acting as a principal and a for-profit business arrangementThis is called being an investor agent where you both list traditionally or you enter into a business arrangement with the home seller.When you were acting as a business owner and a for-profit contract even though you're licensed, that should be fine with your state lawsI know with your question your thinking like a leasing agent charging one months rent. 

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Learn here on BP what you need, without spending the outrageous money they charge.