She knew, just knew, Lex had a way to sneak all his paramours in and out of Lex Tower without anyone being the wiser.
Lois:How many times do I have to tell cat there is nothing going on between me and Lex?
It only made sense that he wasn’t using the same parking garage as everyone else who came to Lex Tower,
Luthor:And have to compete with the peoons, never.
but she never figured the entrance was a block away from the building.
Makes sense, he needs a spacious garage for all his cars.
Even though Cat had insisted that Lois tell her the next time Lex picked her up in his limousine, so she could tail them on her Moped, Lois had done nothing of the sort.
Lois:What did she expect after she put that photo of me and Lex in the paper, and drove another wedge between me and Clark.
