I feel your pain. I was in a similar situation a few years back. The only difference was that my SUV was parked in our underground parking lot (no security gate yet at that time). Left my gear in the back of my vehicle (as I always did back then). Being it in our property and all you think it would be safe. Yea, right. Broke the back window of my SUV, rack gear (Tubeworks Power amp, Marshall tube preamp, Digitech tube pre amp processor, samson gtr wireless system, midi foot contrller, a bunch of cable and picks, and skb rack case), 1x12 cab with celestion spkr, car stereo/radio, some cds, and some barya in the ashtray all gone. A very painfull and costly experience. Took me a while to get over it and to save up for a whole new setup.
Lesson learned... do not leave any valuables with in plain view of people in your vehicle... ANYWHERE!!!