http://www.zillow.com/homes/map/1554-walnut-ave,-antioch,-ca_rb/#/homes/for_sale/map/38.009028,-121.770108,38.008182,-121.772142_rect/18_zm/1_rs/

The house... they are saying that the "second" backyard is not visible from the main yard... that it looks like another property... 2 sheds and tents is what's being described...wish the pic was clearer on zillow