In other words, the slide is strong enough that it could can hang “two blue whales from the slide, and it won’t budge.” No machines were used to attach the slide to the side of the building. One crucial test involved loading the slide full of sandbags to demonstrate a maximum stress level. The observation deck is the tallest in California. The adrenaline-inducing ride lasts only a few seconds. At the end of the slide is an open-air observation deck — the largest in the city — with 360-degree views of the city. Work on the deck and slide began in 2014 and cost $31 million. Tickets to get into SkySpace are $25 for adults, $22 for seniors and $19 for children ages 3 to 12. A ride on the SkySlide costs an extra $8.