It's a shame Lake Side Cafe is closing, because the place is pretty cool: modern; friendly; and all-purpose (it could be a coffee shop or a restaurant or even a bakery).
I had a vegan gyro ($10.50) which was tasty with Upton's Naturals seitan and a fresh cucumber sauce. My only issue is that the portion size was quite small---it was just a half wholewheat pita pocket stuffed with seitan and some lettuce, tomatoes and onions---considering the high price tag. For the same price, you could get twice as much food at The Chicago Diner. That said, I don't think the quality of the ingredients would be as high at The Diner as it was at Lake Side.
I also had a piece of chocolate cake ($4.50) and a chocolate-almond cookie ($2.50). All of their desserts are vegan which was pretty cool to see. The cake had a great, rich flavor, though it was dry. The cookie was also dry and rock-hard; it didn't soften too much even after I microwaved it. It wasn't very good, in my opinion, and had a salty taste that overwhelmed the almonds and chocolate chips.
Most of the menu is vegan and I appreciate that this place served a niche in far northern Chicago. It's unfortunate that it is shutting down but, on the other hand, at least a few new vegan places are opening up elsewhere in Chicago, so the net balance is still positive for the city's vegan community.