By Pablo Jaime S&aacute;inz &nbsp;&nbsp;&nbsp; An iconic educational institution in National City will be celebrating a state-of-the-art building addition to its facilities. &nbsp;&nbsp;&nbsp; On Saturday, August 6, the Sweetwater Union High School District will unveil a new three-story classroom, library, theater, and student services building, at Sweetwater High School (SUHi), National City&rsquo;s only high school. [...]