Gotham Central/Headscratchers

In "Half-A-Life", how did Batman find Two-Face's hideout? He was impersonating another cop, heard how it looked like they were shacked up in a penthouse, then flew off, with the cops following. Except the penthouse was actually underground. So how did he know where to go? I'm 99% sure I missed something, like a single line explaining it...

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