the.com/waterfront

The thin, expensive line where land admits defeat and water wins.

means The land bordering a body of water, especially the part of a city or town built along a harbor, river, or lake.

from A straightforward compound of 'water' and 'front,' with 'front' used in its old sense of the foremost edge or face of something — the part that faces outward. English has built similar words this way for centuries (think 'seafront,' 'shorefront'), and 'waterfront' settled into common use by the 19th century as cities grew up around their docks, wharves, and harbors — the literal face a town presented to the water.

old meaning
Originally meant working harbor, not scenic real estate
idiom
Cover the waterfront means address everything thoroughly
value premium
Waterfront homes can cost 50-150% more nearby
irony
Rising seas now threaten the property they made valuable
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