supervisor chu: and how doelong, for example, does a slurry seal extend the life of the street? >> 20 years. and it is a very cost-effective treatment. part of the entire life cycle of the pavement requires us to do that kind of treatment and it is the same with a building, supervisor. we might build an entirely new building, an entirely new hospital, like general hospital, or we might be replacing roofs. that will last many years and is protecting the asset. even though it is not protecting the entire building, it is considered a capital improvement. should i move on? the road repaving and resurfacing bond before you is designed to invest in the san francisco right-of-way infrastructure, providing funding source for the next three years, and is also funding our sidewalk and curb ramp improvements that are part of our americans with disability act transition plan. the condition of streets in san francisco, that pti score, in three years will be moving up from 64 to 66, and be putting us on track to 70, which is good, as opposed to fiaair, in 10 years. this book create more than