Under the proposals London would be given complete control over property taxes, including council tax, stamp duty and business rates. The London Finance Commission report also recommended giving the city the power to introduce new taxes, such as a levy on tourists, and greater freedom to borrow.
Mr Johnson said there was an "acute need for London to be able to better plan and finance the infrastructure needed to prosper and maintain a great quality of life, in the face of a decade of expansion".
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Council workers uncovered the AK-74 concealed in the undergrowth.
The thief, who used a walking stick, was helped by a man who disabled the lock before pushing the woman away.
More than 40,000 new property millionaires have been created across Britain this year so far amid rising house prices.