SDCI is the Addressing Authority for the City of Seattle. It is essential that assigned addresses are accurate so the property can reliably receive the following services: mail delivery, utilities, and emergency services.
When King County records condominiums as part of the process to assign assessor parcel numbers, they sometimes assign addresses that do not match the addresses we have on record at SDCI. This is particularly prevalent in neighborhood residential (NR) zones with attached and detached accessory dwelling units.
Here is an example of an inconsistent address assignment:
- King County – 123 NW Seattle St, Unit B (condo street number with unit designator at the end)
- SDCI – 123B NW Seattle St (street number with a letter modifier)
There is a difference between a “unit” designator and a modified street number.
To mitigate the problem that can occur with the owner, utilities, USPS, and emergency services, we are asking the developer or responsible party to request address assignments via their Seattle Services Portal account before the recording of a condominium. Requesting an address assignment before recording a condominium will ensure all assigned addresses align across all agencies.
If you have questions or need help, contact SDCI experts via our virtual customer service options.