Red Light District

Hint: How do I open the door in the adult bookstore?

Hint: Where is the blue key card?

Nested hint: How do I demolish the building?
(sorry, cannot decode section)
Hint: Where is the yellow key card?

Hint: Where is the red key card?

Hint: How do I get through the stripper joint?

Hint: Where is the exit?

Hint: What other interesting places are there?