My Backyard is overlooked by a 6 story building
Does anyone have a suggestion for what to plant that will screen at least 50 ft. high and 25 wide? It is on the southern edge of my property, shaded by the building and a large oak 30 ft. to the west. It is also within five ft. of a retaining wall ( there's an 8 ft. drop behind my yard).
Any help would really be appreciated.