A mortgage payment for 80% of the value of the property at 4% interest is $2,712 a month, or $32k a year.
It is currently being taxed $3,400 on a $340,000 valuation. This is right at 1% of property value. The sale of $710,000 will likely cause the taxes to change to $7,100 a year.
Honestly, I am not sure what the insurance cost will be here. Zillow says $270 a month, I am going to say $350 to find a good policy that covers short term rental. $4,200 a year.
The house does not have overly high-end finishes. It is in a coastal area which means it would experience a lot more weather on the exterior. I will call it $5,000 a year.