Target websites that will have double purpose for your niche, SEO and marketing:
1. Submit links to directories that is targeted in Seattle.
2. Search for top blogger (related to your niche) in Seattle area, and ask if they can blog about your website. They will ask for a compensation.
3. Go for reciprocal exchange to websites that can benefit your niche from their traffic - sample: real estate in Seattle, etc. Do not reciprocate to websites that has no use to your site, no matter how tempting the PR is.

This is some tips by using that you increase PR of your site.