Where did the children of grand avenue build their city in the book, "a girl who owned the city"

The Girl Who Owned a City is the only published novel by O. T. Nelson, first published in 1975 ... Although there are abandoned cars in every driveway and lining every street, Lisa is the first child to think of driving one ... Unhesitatingly taking charge, she forms her block-long stretch of Grand Avenue into a militia, armed with ...