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2 sentences on (for example, a great question followed by the perfect answer)
Especially in light of Matt Cutts recent comments about local pizza pages only needing 2-3 sentences to rank,
What Matt said there people should be paying more attention to. I think it is a huge statement. Run with it!
In addition to address and contact information, 2 or 3 sentences about what is unique to that location and they should be fine.
I don't think word count defines shallow content.
This does not mean they will rank (since rank can be misunderstood as = rank well). I believe this merely means the page will not be seen as thin/shallow page. Ranking well is whole lot of different and would depend on other factors too.
It is still not a good idea to repeat a ton of content over and over again. (...) The value add disappears.