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Buteo lineatus
Adults have brownish heads, reddish chests, and pale bellies with reddish bars. Their tails, which are quite long by Buteo standards, are marked with narrow white bars. Red "shoulders" are visible when the birds are perched. These hawks' upper parts are dark with pale spots and they have long yellow legs. Western birds may appear more red, while Florida birds are generally paler.
This hawk was outside my apartment. My buliding is backed up to a preserve with a lot of wildlife.
I agree with Xiaoxuan, it's not a red-tail (the chest pattern is wrong) it's probably a red-shoulder.