Looks similar to one I saw in our neighborhood this week.
Got one out of our warehouse 2 weeks ago, the markings on the B&W pic are about the same, and the head is a lil bit triangular. Almost mistook the one I saw as a copperhead in the low light of the warehouse
Great pics,,,, you must have been pretty close,,,, never seen a black racer or rat snake,,,, have seen lots of blue racers here,,,, eat mice,,,, that's a good thing,,,,
This one just has a white chin like almost every black racer I've ever seen. Black rat has the entire underbelly white with blotches. The head is different on a rat snake, too.
Zero doubt, that's a Black Racer. Ratsnake head morphology is very different, also Racers have smooth scales with a satiny finish. Ratsnakes have keeled scales and a glossy finish.