By Richard MizeReal Estate editorrmize@oklahoman.comPut on your reading glasses, or click on "zoom in," and check out this little-bitty number: 1.7%. It's the vacancy rate for Class A industrial property in Oklahoma City, the same as at the end of last year, according to NAI Sullivan Group's first-quarter industrial market report. That's pretty remarkable, even if flat. Flat's not bad when property is about full, especially after a flurry of activity — thank you, medical marijuana, rapid retail delivery, and general economic strength. That tiny vacancy rate supported an average rental rate of $6.26 per square foot per year on a triple-net basis (meaning the tenant pays for building insurance, property taxes, maintenance and utilities).Read more on NewsOK.com