About 8601-8621 Walker Mill Road Capitol Heights, MD 8601-8621 Walker Mill Road is a a 7.42 ± acre commercial land opportunity in Capitol Heights, Maryland, comprising two parcels and 5.0 ± usable acres. Zoned I-1 (Light Industrial), permitted uses include restaurants (drive-thru permitted with conditions), car wash, gas, vehicle lubrication, car sales lot, bank, building supply store and most automotive uses.