Buller is convinced any pickup in the economy will be felt by warehouse and distribution-center landlords a year or two more quickly than it will be by landlords downtown.

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The government has said it will review the system in two years, but for some landlords, that may be too late.

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In 2003 Saatchi moved his gallery to a spot on the Thames but got into a tussle with landlords and exited the place two years later.

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