I found this information about the purchase of lands for Green Hill:
"In 1887 the city of Greensboro purchased from Judge John A. Gilmer and his wife 57 acres of land, which was laid out as a cemetery. Doctor Gregory and his son, Herbert, made the first map of the same. Later, in 1902, 1907, and 1908, the city purchased small lots of land from Mrs. Mary C. Jones, Commisioner, Southern Loan and Trust Company, and M.J. Adams and wife, which was land East of the cemetery and West of Wharton Street."
(Source: North Carolina Room materials, Greensboro Public Library)
I also have a copy of a very detailed layout map of the cemetery from 1904.
However, this map is so large that I do not believe I can reduce it enough for
a good picture on a computer screen (approximately 4 feet large). I do hope
to find a way to provide you textual information about the map.