We came home last night to hear drip, drip, drip down in our basement. Evidently our downspout on the southwest corner was frozen. We own a 12 unit apartment building and live there as well. Short version of the story is this morning we shoveled off from 2 feet to 4 feet of snow from the roof (it is almost flat) on that end of our building and uncovered the drain area. Then we got a heat tape and wrapped the downspout (as our other ones are), after thawing it out with hubby's welding torch and hot water, so we dodged another bullet hopefully. Sorry to hear about your leak though. It sounds like you got the bullseye. We have lived here over 30 years and this south side of our building has never been a problem freezing before because it faces the sun, so it was quite a bad surprize. Although we did have the north side freeze many years ago, and it leaked in and ruined 4 ceilings in the front apartments, so I know what you are going through. By the way if your ceiling just gets stained and not destroyed just get a spray bottle and fill it with equal parts of bleach and water (1/2 bleach & 1/2 water). Spray the stain and usually it will disappear. Also, sorry to hear that your trip may be in jeopardy, but hopefully your insurance can help with the fix.