The idea is that half a dozen startups can occupy the same office space when each has only three or four employees and can move out into bigger offices when they raise venture capital dollars or develop a level of self-sustaining sales.

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True, in the handful of places where the two companies already share offices, the level of cross-selling is two-and-a-half times higher than where they do not.

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Cole's top-level corner space on the building where his offices are located on the far west side of Manhattan provides a view of the Hudson River.

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