Rothko is a novel 3-dimensional field programmable gate array architecture that is based on the three dimensional VLSI technology developed at Northeastern University. This technology uses transferred circuits and allows for the placement of metal interconnections between layers of active devices. These metal interconnections can be placed anywhere on the chip. Our FPGA architecture, called Rothko, extends the Routing and Logic Block (RLB) model developed for the Triptych architecture to three dimensions. Triptych makes use of a model, similar to a sea-of-gates model, where individual cells can be used for routing, logic, or both. We extend this to three dimensions by adding connections to each RLB from above and below. This makes our architecture truly 3-D with each logic block having connections to logic blocks on other layers. In this paper we present the architecture of a two layer RLB, discuss the 3-D technology we use, and discuss CAD tools for mapping designs onto Rothko.