[1_Rain_Drop]

How did those squatters find out that apartment was empty?
How did they gain access?
Who gave them the key?

[Rumplemeyer]

How did those squatters find out that apartment was empty?
How did they gain access?
Who gave them the key?

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First guess is the building managent employees,

[Brooklyn Attitude]

I read the apt. had no front door. Access was from an elevator that opened directly into the apt using a key.