if you look at the picture on this slide, i believe this is monterey boulevard, taken some time in the '20s, and so you'll see all of those houses were there, much like they're still there today. housing stock in san francisco is aging, but the vast majority of residential buildings were built prior to 1950. because of this, building inspectors often see obsolete and unsafe components or conditions in residential buildings. we see damage due to dry rot, pest infestation, and water intrusion. we see old, unsafe wiring, and oftentimes we see old and ineffective plumbing. now, this next slide shows -- is in relation to unsafe electrical systems. as you can clearly see, this is old nob and tube wiring. and this is an example of deteriorated knob and tube wiring, which possess a fire hazard and is often unable to cope with modern electrical demands. related to outdated plumbing, this section shows sections of old plumbing in need of replacement. problems are old led and joints that are leaking and are not properly supported. you can see the rust, which is a sign of leakage at the joints. bl