At the top right hand corner of the "residential" tab, you will see a page 1 which is showing the main house and garage. Click on the right arrow in that page box and it will take you to page 2 which will show the stats for the rental. The page box on the "residential" tab is in the same area as the one you found on the "sketch" tab of the rental.
There's a seperate rectangular shape that appears to have the same measurements as the 'cottage' - it's 14 wide, which makes it about right.
Looks like two different lots, two assessments, and still no idication of when it was built...but it does look like it's standing on the concrete floor of where a previous structure stood, and at 32' foot long, it's certainly too long for a garage. I give up.