also built. Most classrooms were modernized in 2007, and several portables in the "M" wing were also brought to campus in the same year. In 2012, MSN highlighted Tierra Linda in a feature video, due to the school's construction of several low-cost, energy-efficient portables to its campus. Traditional portables are among the least energy-efficient buildings in California, and the Tierra Linda portables, constructed by Green Apple Classrooms, were noted for their forward-thinking design. 2015–2018 Renovation and Restructuring Throughout San Carlos, schools were predicted to experienced increased enrollment, necessitating the construction of additional classrooms. As most elementary schools were already nearing capacity, the San Carlos School District opted instead to bring fourth grade students, previously at elementary schools, to its two middle schools. Schools were restructured into three levels: grades K–3 elementary schools, grades 4–5 upper elementary schools, and grades 6–8 middle schools. Tierra Linda, which had previously unofficially divided students into a Lower House (for grades 5–6) and an Upper House (for grades 7–8) was split into its current 6–8 school and a new Mariposa Upper Elementary School.. The Measure H Facility Bond Program, passed in November 2012 by San Carlos voters, was used to fund the renovation of Tierra Linda and Mariposa classrooms. Between 2016 and 2017, the school office was remodeled. The former multi-purpose room, which had been in use since the 1950s, was also torn down and rebuilt, rebranded into a wide-open "Learning Commons" building to be used for individual workspace and group projects. A row of classrooms on the school's north side, officially named buildings "C" and "E," were officially changed to be used as fourth and fifth grade classrooms at Mariposa. One of these classrooms is also used as the school's orchestra room. Construction was delayed significantly, due to missed delivery dates from various companies. Overall, the project cost about $5 million more than the district initially budgeted. A year after the expected completion date, Mariposa opened to fifth grade students in August 2018, and fourth and fifth grade students in August 2019. The two schools share facilities such as the library, Learning Commons, band and orchestra rooms, and play structures. Despite newly painted classrooms, exterior fencing, and TV monitors in each classroom, the construction remains incomplete as of the 2012 facilities plan, due to the fact that Mariposa lacks a separate Learning Commons or multi-purpose space. Electives and Programs Sports and Extracurricular Activities Tierra