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Sorry to hear about the thefts - a friend of mine had his bikes stolen in the same way.
They used an emergency service key (can be bought on eBay/Amazon) to bypass the magnetic building door then when straight to the electrical cupboard and turned off the magnetic locks of the bike room.
They did not cut any bike lock though as they stole the full racks since they are only attached with 2x bolts. A big design flaw for which you can't sue the developer!
And they came back three times on separate days to raid the full bike store.
My friend management company had a vault type door installed afterwards which requires both fob & keys to be opened so can't be bypassed by turning off the electricity.
Three days after stealing my Cannondale thieves returned to my building at 2:25am, forced their way into the bike room and stole 5-10 bikes (it's hard to be sure) over a period of 2 hours!
This time they got my wife's hybrid bike -- if you see a coral Specialized Sirrus 2.0 like the one attached for sale please let me know.
(A reminder to get insurance if you can't afford to lose your bike -- I always thought of this bike storage room as being quite safe and thick kryptonite locks as taking too long to cut for the average thief, but I was wrong!)