The only thing that sounds out of the ordinary here is the water bill

All water, sewer, and electrical infrastructure is being replaced.

Metron and Southern Water Management are two that we've been talking to.

Purchase price: $465,000 Cash invested: $80,000 Checkout my Airbnb here: airbnb.com/h/madeirabeachoasisSalt Water Pool & Hot Tub: $60,000Tiki bar with electrical hookup: $3500

Try to anticipate other potential avoidable situations with a follow up inspection to assess the Locksmith’s work and ask your tenant(s) if you can also use the time to assess for other issues such as unchanged HVAC filters, leaky pipes, working shutoff valves, working smoke detector batteries, properly working downspouts, clogged dryer vents, evidence of water damage from leaking roof, etc,etc,etc.

Purchase price: $465,000 Cash invested: $80,000 Checkout my Airbnb here: airbnb.com/h/madeirabeachoasisSalt Water Pool & Hot Tub: $60,000Tiki bar with electrical hookup: $3,500Mural: $1600Interior Furnishings: $6,500Exterior Furnishings: $1,500Monthly gross booking revenue: $8,000-$12,000

Your PM replaced the water heater because it was leaking.

Purchase price: $465,000 Cash invested: $80,000 Checkout my Airbnb here: airbnb.com/h/madeirabeachoasisSalt Water Pool & Hot Tub: $60,000Tiki bar with electrical hookup: $3,500Mural: $1600Interior Furnishings: $6,500Exterior Furnishings: $1,500Monthly gross booking revenue: $8,000-$12,000

It's hard to say offer amount without knowing the rehab part since that could blow this out the water.  

On top of that, the water pipes are on the ground, which is not allowed; they should be run inside the walls.