Thermally upgrading single glazed windows is never easy, but when the windows in question are 2m wide by 4m high, and made from bronze, the task becomes almost impossible. This was the challenge facing architect Fletcher Priest when it was asked to turn a redundant office block in the City into an office fit for the 21st century.rnThe building, which is next door to the Bank of England, was built in the fifties. The plan was to redevelop the site by constructing new offices behind a retained Portland Stone facade.
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