Some prospective colocation data center tenants view power and cooling best practices as constraining. However, an effective acceptable use policy can reduce downtime due to thermal shutdown and human error, reduce stranded capacity, and extend the life of the initial leased space, avoiding the cost of oversized reserved space. This paper explains some of the causes of stranded power, cooling, and space capacity in colocation data centers and explains how high-density rack power distribution, air containment, and other practices improve availability and efficiency. Examples of acceptable use policies that address these issues are provided.