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To give some numbers. The building of JP Morgan in London was bought for £500M.

https://en.wikipedia.org/wiki/25_Bank_Street

Hope that someone here knows the price of lightning so we can get some comparison going on :D

Price of 24 hour lighting is about £1 - £2 per watt year (standard overhead fluorescents). For typical office building lighting intensity, that's around £15 - £50 per m^3. Assuming the high end of that scale, for the building you mentioned, the yearly lighting bill would be £5 million.

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