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... Preventing stormwater from carrying pollutants into the ecosystems around an area. But a few states over, in Colorado, the semi-arid environment makes water a precious resource. There are significant number of unknowns, even if you just look at the water retention requirements, colorado has very extensive water rights laws. There are also mechanical and engineering challenges, plus ongoing maintenance expenses and concerns costs will be passed down to consumers, hurting smaller businesses and renters. Whether it's office rents, or apartment rents, the biggest complaint we hear daily in Colorado right now is rents are too high, said developer Jim Neenan, president and CEO of Prime West Development. Another issue raised is that it impacts all buildings of a certain size, regardless of whether it's a church, historical building, non-profit or affordable housing. You can drive around the city or walk around the city, you can see example after example of buildings that there would be no way to put a green roof on.