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Hello, I am looking for some advice. I am working with a real estate client. They have a main website, and then several separate agent websites. The agent sites share some content with the main site, as well as having some unique content. My question is what is the best way to track visitors? Should I have separate Google Analytics accounts for each site, or should I use one account and separate profiles?

I am working with a real estate client. They have one main site (ie. company.com) that contains all the info, then they have several name domains (ie. salesrepresentative.com) that are forwarding to the main site, but use domain masking to appear as if there is a separate site for each representative. My question is how can I make this legit in Google's eyes, or is this totally not advised?