trying to estimate income with weekly seasonal rental

[Shawn Banzer]

Hello, I had a lead come through today that really intrigues me. This is a pocket listing from an agent and I am not sure what the asking price will be yet. The property is located on a extremely attractive lake, it has 50' of frontage as well as a dock. I would use this property as a weekly rental, my problem is how to analyze the deal when you don't know how much vacancy the property will have from year to year. I have looked at other similar weekly rentals in the area and they seem to be booked for all of the peak season, and I will be calling some property managers in the area tomorrow. would you just put a lot more away for vacancy to account for weeks that it doesn't get rented? and has anybody found a way to accurately analyze a deal like this?