I'd like to comment more on the rest of your post, but in the interest of time, I'll just address this one part.
Quote:
Originally Posted by GGG
To me the key to new communities is to bulid in office space commercial and tax it less if required. The office space near Cattlebaron in the deep south is a good example of decreasing the number of downtown commutes.
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This can create other problems. What about someone who lives in the north in, say, Edgemont, and their previously-downtown-located place of employment moves out to Sunpark Plaza (the business park you are thinking of). The commute for that person (and probably a good portion of the other employees) has now gotten considerably longer. Not only that, but the area in question has worse transit connections and is not very well designed for the pedestrian (by comparison). Now, one answer for the individual employees would be to move closer to work, but as calculoso pointed out earlier, there's a good chance that their spouse works elsewhere in the City, possibly downtown or in another employment area.
Such effects of employment decentralization can be mitigated by locating these developments near current or future under-utilized transit nodes (primarily train stations), and designing them using TOD principles.