Thanks, Miriam, for an excellent and thorough response.
Regarding some of the points you brought up:
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We are planning to have the central location remain the flagship store, at least for now, so you're right, it does make sense to keep the focus as is right now, although we're busy tinkering away at a dynamic solution that pulls the address closest to the searcher.
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One of the new locations is not in state, but is in the same metropolitan area, while the other one is half a country away.
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Our biggest concern, and the source of our paranoia, is the fact that we have had a massive headache with Google Places for the last year and a half. We initially launched our first expanded location late 2010, and the minute we put the address on our main page, the two listings merged in google places. Since then, we've had nothing but problems with local. Our listing has merged with multiple other listings, has disappeared entirely and come back, etc. In fact, the reason you didn't find it locally is that we're currently trying to disentangle two profiles, one of them being correct and the other created automatically by google with an amalgam of our info and that of other businesses in the area.
Our fear is that if we add multiple addresses and location information to the website, our places issue will magnify a thousand-fold, and in a walk-in business like ours, a single local result is worth 10 first place organic rankings.
Thanks again, and I hope this clarifies our gripping terror somewhat.