Also, Central Florida is a hot market right now and probably still will be in three years but who knows.

In a hot market/area it isn't uncommon for a tenant to make this type of offer to make themselves stand out from the crowd.

I recommend everyone read this, there's data against hot tubs, sump pumps draining into septic systems and yes even water from latex and other paint brushes going into the septic.

I had to pay the tenants in apartment 3 to leave so I could begin the major renovations which included a complete re-wiring and re-plumbing of the entire building as well as separating out the single heat and hot water source that was all the previous owner’s responsibility to pay.By June, the plans had all been approved and the renovations were underway.

So I break out my tester , its hot before the meter and dead after .  

New London County isn't too hot for multi families.

It happens all the time in hot markets where parties reach an agreement and may just be wait an initial by one party and another offer comes in and the contract is rescinded. 

There is a LOT of focus on Oakland right now and for good reason (Super hot market!)

If you are in a hot market, I say try FSBO for a week or two, if it doesn't sell then you could always list it. 

Generally expensive to file it though as it's time and technically intensive.