Oregon County Assessor - Elected Position

County Assessor is an elected position in Oregon. (non- partisan)
https://www.oregonlaws.org/ors/204.005

Term of Office is 4 years
https://www.oregonlaws.org/ors/204.010

Deschutes County Assessor Scot Langton has filed for re-election in 2018 General Election.
https://www.deschutes.org/sites/default/files/fileattachments/clerk039s_office/page/11220/assessor_langton_redacted.pdf

There are matters of Public Benefit related to the performance of Assessor duties.  Public benefit related to tax on a single tax lot or some number of collective tax lots all having a common benefit.

This is a King County Washington link to the Public Benefit aspect of  property tax.  In this case the benefit of Open Space.
https://www.kingcounty.gov/~/media/services/environment/stewardship/sustainable-building/documents/resource-protection-incentives/PBRS_App_March_2013.ashx?la=en

In Oregon there are various ORS, OAR, and local level government rules and regulations aim at promoting the public benefit.  The benefit of the "at large" benefit to everyone in the state.  Some programs for the Public Benefit are supported with incentivized tax reductions.  At the county level property tax reductions for any official reason deemed to be in the interest of Public Benefit reduce property tax on tax lots that offer in some manner a "Public Benefit"

Oregon has property tax law and rules that promote Public Benefit by tax reduction incentives applied to property tax.  The direct benefit of these incentives to any given county and city (officially defined as "local government") is an incentive to the tax lot.