Why was it built?

Towards the middle of my usual route there's this unusual house for sale. It has a platform-like deck in the backyard. The broken fence exposes the backyard to the street and you can get a sneak peek of what's going on back there. This deck does not seem to have any reason to be back there. It's weird. Why would it be so crammed up into the corner? You do not get a better view of anything by being up on the deck. Perhaps it was used as a cooking area for barbecues or maybe it was used as a stage for Shakespearian dramas during the summer. Your guess is as good as mine.