Garbage here too.
My mom has a good system - she has an empty coffee can that she put shelving paper around (so it wouldn't look like an ugly old coffee can), and has the plastic lid beneath it (so the can doesn't leave marks on the tile countertop). Anyway, she keeps this can next to the coffee pot, for the old grounds. When it's full, she empties it into the garbage.
I always thought it was an odd idea till the day my coffee filter broke on the way to the garbage can.
Another idea for coffee grounds: even though you're in a condo, you may have plants that are acid loving, such as camellias, azaleas, etc. They love a good dose now and then (and it keeps cats away too).