Nonresidential construction input prices fell 1.8% in July, providing evidence that the worst of skyrocketing costs for building materials may be in the rearview mirror. An Associated Builders and Contractors’ analysis of the July producer price index, which measures the selling prices of goods and services, found input costs were down in eight of 11 subcategories for nonresidential construction, with a 27.6% reduction in natural gas costs leading the way.