On average, listings lease in the $20's per square foot per year. The King City submarket is going through a a boost in rates. In the last 3 months, the median rate rose $24 per sqft per year.
Compared to the rest of the Greater Portland market, the King City submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 0 listings have come on the market, which means spaces might be going fast. You'll want to be prepared to make an offer immediately. About NaN% of the office spaces in the King City are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,360 sqft. Most buildings in this area were built in 1978 and are Class B.