Fair market appraisel- financial aid

After many years of filling out FAFSA's without this being an issue, my daughter's college is trying to view my timeshare as traditional real estate and has changed by FAFSA. I actually had to send them an email from the tax assessors office in the town of the timeshare to prove that that we did not have a tax valudation. I need to prove fair market value for a prime fixed week at The Cove at Yarmouth, MA. I have done some online searches I doubt they will take that and I can not see that the sales (resales) are public record on the town hall site. I emailed the GM at the resort but am not sure where else to turn.