Congratulations on the new job! Caring for plants in offices is what I started doing 20+ years ago and I am still at it!

You are correct that Hibiscus, like most flowering plants, needs to be quite potbound to flower. In addition, they need an enormous amount of light to flower indoors, more than the average home or office can provide, especially in northern latitudes. Most folks put their Hibiscus' outside during the warmer months to get them to flower. They bring them inside in winter to protect then from the cold. During the winter indoors, they go semi-dormant, especially if kept on the cool side. This winter rest period will also help promote flowers next summer.