Resident agrees not to place into any drain lines of the Premises any non-approved substances, such as cooking grease, sanitary napkins, diapers, children’s toys or other similar object that may cause a stoppage.

These mostly revolve around manufacture of controlled substances or manufacture or sale while in, or from, public housing. 

@Raul Nico Ruiz   I used Shawn Huss at Chemical Bank.

Generally, the only time a building is required to get a Certificate Of Occupancy is when a new building is constructed, when an existing building is converted from commercial to residential and maybe after an existing residential building has been deemed to be unsafe by a government agency after the building is destroyed by an earthquake, fire, flood, chemical spill, or sewer waste spill.

And in general....I've lived in Seattle for all my adult life,  and been a small landlord since 2006.Its true that supply and demand is a fundamental law of economics, and as more comparatively well off people pile into seattle, housing is going to get more expensive and the bottom-barrel housing units that used to be out there 10 or 20 years ago that people who were living solely on disability or SSI or maybe could hold down a low wage job despite issues like substance abuse or mental illness were able to afford is getting redeveloped.   

Irritates me that books of so little substance can create so much hype. 

They usually don't do drugs or have alcohol or any substance issues. 

One issue that was not mentioned in this thread, is the water pollution of the drinking wells by polyfluoroalkyl substances, known as PFAs.

One week later I learned that her boyfriend had kicked her out due to an out of control substance abuse issue, and had sobered her up for a day to get her out of his house. 

It happened on a Friday night at 2AM and might have involved other substances.