For the date: use the date you purchased the home
For the fair market value: determine the fair market value of your home before the damage (your tax records) and apportion the room to that value.
For example: If you home was 2000 square feet, and your living room is 15 x 15 (225 sq ft), it is 11.25% of your home; you will use 11.25% of you home value as the fair market value.
