Builders seem to be flush with cash after selling their spec builds effectively.

I understand market concerns as well as standard marketing methods, but I am really wondering if anyone has done any effective, outside-the-box marketing that has helped them sell their flip property.

PM me the address, I'll tell you if you have a case.

Does anyone have advise for a marketing company that is effective using direct mail, email, or whatever? 

Utilities are generally public and you can call them to get averages, taxes are public as well and can be pulled either from a assessor website or at their office, insurance companies can give you cash value and replacement value quotes by giving them an address, general rule for running calculations for vacancy is 5-10% of gross income, I have seen maintenance expenses all over the map (anywhere from $300-750 or a % of the rent - those vary depending on the number of doors in the deal as well as how much deferred maintenance has to be dealt with or how much rehab you are going to do to negate the deferred maintenance), contracted services, call a few landscapers and get quotes and use those for your analysis. 

Post the addresses & numbers....Let's see what you have.

If the previous owner had defective title and the cause of that defect was not addressed in the tax deed process then even a prior owner or lien holder could have a claim.

Such notice shall be given by certified or registered mail, return receipt demanded, addressed to the last known address of the mortgagee or lienholder

From my Fair housing attorney:“Did you see that Saint Louis Park passed an ordinance that anyone buying a property and raising rents or giving notices that have an adverse effect on affordable rents – will have to pay cost and relocation of up to $4500 per tenant?”

How about giving us a real world example of a property you bought in the last 12 months, with address to show us what kind of deals we are missing out on.