https://maps.assessor.lacounty.gov/m/ That's the website I use. You can click around to bring up each lot's details in the sidebar. Washington east of Fairfax/Culver City limits definitely should use the prefix to differentiate from East Washington addresses. The west prefix reappears in the addresses of lots (seems like most, but not all lots) west of Sawtelle to Del Rey/Culver City limits. I would caution against depending on street signs because I've found errors (e.g., misspellings, using the wrong suffix, etc.) on street signs and I use that county assessor website as my reference point.

As for Washington Blvd. west of Del Rey, you're right. That part doesn't use the same grid numbering system as the rest of Washington Boulevard, so I'll remove the prefix. I have no idea how I missed that.

Best,
CTS

Additional question: why were so many benches added in areas where there are none, such as in the middle of sports pitches or along city streets on private property? Were these supposed to be tagged as something else?

Why did you add a post office node duplicating an already-existing node (358826219) for that post office? They have the same information. Please delete your duplicate node and add any new information or edits to the previously existing post office node (358826219).

I also edited East 26th Street: I downgraded the portion of it inside an active rail yard to a service road, made that portion private, and adjusted its road geometry