Robert Frank, this morning in his blog, wrote about the number of London mansions that are expanding their homes underground. Apparently zoning restrictions make it easier to expand down than up for their recreation, parking, and staff quarters. Neighbors are concerned about structural issues and any effect on the city’s water table – power lines get cut during the digging as well.

You can generally see buildings from the ground or the air – I wonder how encroachments would be determined under the ground …

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