The tower will increase the number of beds at the hospital from 214 to 392.
Banner Estrella CEO Deb Krmpotic says the new addition will have a lot to offer.
"The first floor is going to be fully dedicated to women/ infant services... So, OB," said Krmpotic.
"We delivered 4,129 babies last year, and with the new addition, we hope to deliver over 6,000 babies."
The second floor is for diagnostics, while floors three through six will be for general medical and surgery patients.
Krmpotic's favorite thing is that the new addition has lots of windows, which will add much-needed light to the first floor.
"That will be able to promote newborns into getting their biological clock established really young," she said. "We're excited about the use of light in this building."
The new addition will open in stages starting next week.