There is a lot for rent in St. Johns County and that is taking the price down a little. But, it sounds like you have a unique property in a desirable location; 4 bedrooms AND baths a block from St. Augustine Beach. Without seeing the property, I am going to give you a range of $1500 to $1850. One may hope to get $2000 or so but in my experience it is very difficult to find a tenant with that kind of money.
I manage a couple dozen properties across St. Johns County, mostly for out-of-town investors.
St. Augustine Realty