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[edited by: inbound at 4:12 pm (utc) on Oct. 9, 2009]
[edit reason] Specifics Removed [/edit]
You could probably extend this to showing the details for both offices on each page (and, importantly, have a page dedicated to each office with things like directions, map, description of specifics such as important staff boigraphies & comprehensive service list - make sure you link to those pages, probably in the heading that goes above the contact details for each office e.g. "Widgetville Office") as that still would not take up too much space - or put details for one office up and just link to the other.
Getting 2 locations performing well should not be too difficult, at least it's a managable number.