This year marks the 50th anniversary of Heritage Oak Cliff’s premiere event. Built on a heavily wooded two-acre lot in southern Oak Cliff, the house owned by David Cooper and Allen Haskell is one of the 10 featured in this year’s Heritage Oak Cliff tour of homes, happening Oct. 26-27. Two commercial properties are also included on this year’s tour, as well as a bonus home built on the edge of the cliff overlooking downtown.