Dynamic location-based "child sites" for corporate website?

I am currently in the process of designing a website for a real estate company. I am having some difficulty, because I need a user to be able to select a particular office/location (ie: Los Angeles, CA) and subsequently have the site reflect their selection. In other words, pages like "Meet Our Team" would need to dynamically only display employees for Los Angeles, CA. Similarly, a "Search Property Listings" page would need to dynamically show only listings in that particular location.

As of now, I am stuck designing separate versions of each page for each location, which is going to take forever and I will have to go through all of them every time I make a change. What would be the best way to make this more "dynamic?" Cookies maybe? I'm only a novice web coder, so detailed answers would be much appreciated. Thanks!