This is a movie and police-procedural TV-show cliche that we all know: The police captain (or insert-your-favourite-law-enforcement-officer) realises he (I can't recall it ever being a she.) has a "situation" involving bad guys inside a building that he needs to get out. He shouts: "Somebody get me the plans to this building!". Minutes later the cops are spreading out the blueprints on the bonnet of the car to find the best entry point.  

[The Bourne Ultimatum](http://www.imdb.com/title/tt0440963/quotes) is a random example:

> VOSEN: Get an elevation and a floor plan, tic-tac-toe.

In that film, the blueprints were immediately sent to an agent's phone.

I know it is all exaggerated in the movies, but my question is "Is there a morsel of truth to this?"

**Is it a legitimate and common police tactic to obtain copies of floor plans before embarking on planned raids?** Or is this another item that cops roll their eyes at when they see it on television?

I'd accept it as a "Yes" if it was true in any major city in the world. In the absense of that, I'd (provisionally) accept it as a "No" if there were any official denials from major jurisdictions. Open to other evidence too.