The rolling hills, lush meadows, and verdant woodlands at Rock Hill Farm in Willistown offer you glimpses of the earlier. They are also the concentration of a struggle about the potential — not only of Willistown and Chester County, but of after-rural, suburbanizing communities in other collar counties of Philadelphia, the place bucolic vistas prolonged treasured by locals are supplying way to McMansions and Wawas. “These significant tracts of undeveloped land, these heritage landscapes? After they’re absent, they are gone,” mentioned Pennsylvania Point out Sen. Carolyn T. Comitta, a Chester County Democrat. Prolonged owned by a conservation-minded nearby household, Rock Hill Farm was acquired for $25.4 million previous December by…