The new building will house the school's media center on the first floor and 10 state-of-the-art classrooms on each of the upper two floors.
Future Pointers from area elementary and middle schools were invited to add their signatures to the beam that is approximately 30 feet long and had been painted a golden yellow to match PLHS colors and mounted atop several stands.
"We are very excited about this new building," said PLHS Principal Hans Becker. "This is the first time in 96 years the school has received a whole site modernization of this scope. This new building is going to be beautiful and will represent what this school is, the best school in San Diego."
The building is expected to be completed in time for the beginning of the 2021-22 school year.