Okay, so David Hunt has a broad range of skills in interior design, architecture, and construction. He's based in San Francisco, which is a hub for design and architecture. His expertise in sustainable design is in demand, but so is his experience in renovation and construction. Considering his skills and location, I'd estimate his hourly rate to be around $125. This is slightly lower than what I'd expect for a senior interior designer in a major city, but it's still a competitive rate. It's also worth noting that interior designers with construction experience can often command higher rates, so this is a reasonable estimate.