24/7 Customer Support. Conveniently located near the intersection of E Twiggs St. and Channelside Dr., right next to Hwy. 618 (Selmon Expressway), Seaport Storage in Tampa, FL is dedicated to providing you with the most professional, safe and convenient self storage options in downtown Tampa. Our friendly Self Storage Specialists sit just inside the beautiful Bell Channelside Apartment leasing office, and here to assist with all of your moving needs. For many of you, this may be the first time you need storage. We know that the moving process can be stressful, which is why we at Seaport Storage are dedicated to making your Tampa storage experience a positive one.