Chipper Shed

Appearance.
As it implies, it looks like a wooden shed containing what looks like to be a type of woodchipper (a.k.a the Bloonchipper.)

Cost.
You need at least 15 power, one tile with 3x3 space and 450 BMC Cash. It takes 30 minutes to construct & for each one built will yield a bloonchipper for use as seen in the top right-hand corner of the image provided.