Last night I watched a program on our local PBS station about FLW, and the beautiful Darwin Martin House in Buffalo, New York. The program also focused on the relationship between Wright and Martin, and was extemely interesting.
One Wright scholar describes the Martin House as "the most important house design of the first half of Wright's career, matched only by Fallingwater over 30 years later
." Over the years this house was abandoned, vandalized, and some parts were even demolished, but it's now being completely restored. For more information, see The Darwin D. Martin House Complex