Limestone Mountain (fire lookout), from a cut line just to the west of it along a service road. The summit, with the lookout building on it, is the point to the far left which looks lower from here.
In the summer you can drive up to the fire lookout's service road (description in Mike Potter's book), and start from much higher up. However in the summer you cannot reach the summit - the lookout - unless invited up by the lookout intendant. New rules after a disappearance a few years ago. So its much safer to go in the winter when the lookout is not manned. Then (I'm assuming) its perfectly fine to go up to the building.