mobile home parks in palo alto because the school district is amazing joining us on science is gabriel metcalfhe is the director of spur. in our google hang out is jennifer frieden bacch. andnd iin the hang out maria isa housing rights organizer for just cause. gabriel it's all about supply and demand. as is the case when this happens in most steve. do you think there is something that is going on that is thank that is unique to san francisco that makes it difficult to find affordable housing? >> i think we came by this problem honestly, the we are telling with it are first it's a great city. and second our regional economy is generating a ton of jocks. jocks -- jobs so it's a nice problem to have. the third reason it's our own fault. we have not allowed s so very mh housing t to be built in decade. a lot of demand to live here and a constrained supply because of our own choices. the inevitable results is sky rocketing prices it's a really bad situation. the down sides of this far out weigh the up sides, although there are both. there will not be an easy solution. but there are things we can d