I'm sad to report that my cat has gone missing

He was laying beside me when I went to sleep, then yesterday morning my boyfriend asked if I'd seen him. We checked his favourite spot under the bed and then looked in every other place we could think of. Since we live in an apartment the only explanation we can think of is he got out on the balcony and fell off (3rd floor).
There isn't really much around the building that he could hide in, so he could pretty much be anywhere. We went out to look for him but no luck, went out again around 3:30am hoping he'd come out while it's dark but nothing. I put up some basic flyers around the building last night, and a few around the neighbourhood today. Called Animal Services, called his microchip company that put a flag on his number. Hopefully tomorrow I can get some nice flyers printed with his picture, I'll see if I can put them up at local vets and stores etc...I don't really know how many to make or how far to put them. Since there isn't much around the building, and where our balcony is there's bright lamps from the parking lot, so I don't know if he'd try to come back here... Just wish I knew where to look, there's a million places
Any suggestions appreciated, most advice I've read mostly applies to houses with porches/yards.
If anyone from Toronto reads this, keep an eye out for him, we're 1 block east of Queen & Roncesvalles.