If it turns out to be a girl, then you shouldn't have too many problems rehoming it, so I'm writing the rest of this post on the assumption that it's a cockerel.
City farms are unlikely to take it. I used to be involved with one, and every so often cockerels would be dumped over the fence overnight. They were always quickly dispatched, as we had no use for them.
Unfortunately, unless the city farm already has some buff orps then they are unlikely to want it - not only have they got to go through the faff of introducing them, but they will be concerned about biosecurity (although obviously this is less of a problem given that it has been kept alone). Plus, this is hardly likely to be breeding quality, given where it has come from.
Whatever you do, if it does turn out to be a cockerel then don't put it in the local newspaper as 'free to a good home'. Gypsies & travellers pick up such cockerels, invariably tame and gentle, to be used (i.e. killed) for training their young fighting cocks.
Unfortunately, if it does turn out to be male, and you can't keep it yourself with the addition of a few lady friends, then the kindest thing to do may be to put it down.