we also looked at one prepared by cillo which showed about a four -- a four% increase in real estate, housing prices and areas adjacent to facebook. we look at census tracts were facebook employers were employees were likely to live and estimated the differential in housing prices there compared to comparable neighbourhoods further afield from the facebook headquarters, and a similar study done by some other academics showed, and even higher impact, like a 33% impact on high and real estate adjacent to company headquarters. we jews of that conservative of the three studies. this was done by the ucla state team. they found, and he looked at 725 ipos in california between 1970 and 2017. is a very extensive analysis and what they found was the impact was 1.8% for an i.p.o., that is an average in average, summer higher, similar lower, we took that as the standard since it covered a wide variety of companies and economic cycles and we are all based in california. we have shown the value, starting with the current median value of residents in san francisco and then we applied the 1.8% to ea