My First Observed Pin Cushion

"Mortgage Surveyors" or "Lot Surveyors" come in and usually find or set front corners using C/L control.

Only if the C/L control hasn't been paved over a few times. Some surveyors don't want to take the time to break out a hammer and a chisel and make a square cut in the road. Instead, they might work their way down from a block corner, which they haven't proved to be good.

@field-dog 

Centerline control simply does not exist in the area in which I work.  The surveyor does everything, including drawing the plat, and setting monuments at block/lot corners.  Coming back after paving of streets in the subdivision to set centerline control does not happen.  That's why the lots/blocks were monumented prior to approval of the sub plat.