Nearly two dozen bug foggers were ignited by a pilot light, blowing out a support beam on Pike Street.
Bloomberg estimated that between 200 and 300 homes will eventually have to be bulldozed.
55,000 New Yorkers are still in the dark after Hurricane Sandy and a Nor'easter tore through the region.
"My roof is in that field over there," said a resident of Kissam Avenue sorting through remains.
Take caution against charity scams, shady contractors and price gouging in the wake of Sandy.
Tenants were left without power or water with little idea of when they would return.
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