I am currently working on a project where we are returning an historic building to original use (hotel). It was built in 1926 and had been used as a retirement home for the past 45+ years. The plumbing fixtures in place are original and utilize considerable amounts of water (3 GPF) for toilets, etc. In calculating the improvement efficiency, do I have a case to argue that Title 24 - 2005 (California) is an unreasonable 'baseline case'? We show significant improvement from that standard, but the reality is that we are dramatically improving water consumption over the existing conditions.