I believe that this value will continue to fall for some time. I further believe that when this value turns positive it will be a powerful signal to indicate the bottom of the market has or is just about to occur. In other words, don’t buy if you can avoid it until this indicator goes positive.
Don't sell now either if you can avoid it. Wait until things pick up.
Might not be a bad time to build, though, because the price of building materials is down and builders are hungry for work.