British Land, one of Europe's biggest listed property companies, reported full-year results last week and the key takeaway is this: London property prices are still going crazy. The value of the property owned by British Land went up by 12.1% last year, while the value of its office and residential space jumped by 18.8%. British Land said this was due to "the strength of the London market and our actions." British Land's "Cheesegrater" building in the City — proper name the Leadenhall Building — smashed rental records in London last year, with space going for £90 per square foot. British Land said today the building is now 84% let.