if you are looking for a non Police solution (not that you aren’t entitled to that or that I’m saying you shouldn’t by any means). There is a harm reduction org in the area (SPARC) that has good rapport with users in the area that might be able to engage the people of the house for you (and anonymously). But idk how much they are involved with dealers as opposed to “low level” users.

If you want to engage the police the district leadership are usually pretty responsive to that kind of stuff (atleast vocally idk what it looks like in the back end) but the district emails are on the BPD webpages or if you go to their monthly meetings (hybrid w/ a zoom meeting) you can talk to them directly and the district detective units usually give their direct contact info