Maria Mancinas has waited more than 30 years to see a 25-acre vacant lot along University and Mesa drives called Site 17 be developed. She was one of more than 50 attendees at a neighborhood meeting on June 25 with Culdesac, the developer the city selected to transform the area. In the 1990s, the city bulldozed some 60 houses in a largely Hispanic neighborhood to make way for an entertainment district that never came. It spent millions to take o…