At least I think its a succulent. The leaves are somewhat thick. Ive had it about 2 years. I rescued it from the trash at work. I saw it and asked the manager if I could have it, he said sure. No pot, no tag. And I haven't seen any similar plants since. It started off just a clump at ground level, then it started growing taller. ( photo / image / picture from TheBip's Garden ) ( photo / image / picture from TheBip's Garden )
If you put it in some brighter light, some direct exposure, it's true identity may become more apparent, especially if the leaves are supposed to be upright. I suspect that's why you haven't seen any similar plants.
I was looking at pics of Aeoniums, it could possibly be that. Maybe. I have a Jade plant and this looks nothing like it :/