The couple of red flags on this look more like a red fireworks display with this little extra insight.  

I have a situation developing that I need advice on.Single family home, lease is expiring, tenant is scheduled to move out end of this month.I didn't even advertise online, just put a for rent sign in the yard last week and already have 5 people called me expressing interest to rent.I called tenant and spoke to him to schedule a move out inspection, where he would also surrender his keys, I will need his new physical address, and I reminded him about turning off water, electric, cable TV etc...He said no problem, BUT...the fireworks and his boat will need another week or two.He has parked a sailboat on the property.

It will make a brilliant firework in your backyard when struck by lightening!!!

-aerial fireworks being shot from the property. 

This fizzled out faster than a fourth of July firework.

One screen broken and burn marks on my pool deck in 4 places, I suspect fireworks.    

The fireworks, burnout, and trash are constant.  

Annual fireworks location for $5,000 to $15,000, food truck parking for $300 per day, parking for the next door mechanic, rent to vegetable or Xmas tree or pumpkin stand annually.  

Yep, you don't want them storing gasoline and fireworks down there....

But hey trial by fire works for some people so do what you see fit.Goodluck man!