The GatherUp Chrome extension (previously GetFiveStars) allows you to easily generate the Google Write a Review link for any business. It works for service area businesses where the address is hidden as well.
It has the added benefit of surfacing the Maps URL, the Google Place ID and the location CID for any location. These are important values to archive for diagnostics if there is an issue with a local listing.
1. Install the Google Review Link generator as a Chrome Extension
2. Head to Google search
3. Search for you company + address and retrieve a single Knowledge Panel result for the business
4. Select the GatherUp Extension and you will be directed to a new page that includes the "Write a Review link"