Kevin, that's a very interesting find - cool!
I knew of the actual track layout there as shown, but did not know it used to be Greece Lumber. By about 1961 the property was used by L.B. Finewood Construction Company, and was where they parked their dump trucks, cranes, dozers etc. When Greece Lumber moved to the Latta Road location (B&O customer designation BL-81) I don't know. Perhaps the general cache of maps you found that in also covered the Latta Road site and would tell who owned it.
That track was physically still there crossing Ridge Road and into the property in the 1960's although the switch was gone and I never saw any cars in there. I would not be surprised if the rails are still there on the property, buried under the dirt.
EDIT: As C.P. Smith says, "GTS - Google That Shi...." I mean Stuff! I did, and found the following:
"L.B. FINEWOOD, INC. is an entity registered at MONROE county with company number 99056. L.B. FINEWOOD, INC. located at the address 788 Ridge Road West Rochester, New York, 14615. Company is incorporated on December 18, 1956. Current status of the company is active."