Tall people, and I mean REALLY tall people, have trouble finding bikes that are big enough. There are numerous reasons for this, and things are starting to improve, but still. We just came across this touring bike built by Terry Osell. The seat tube is 75 cm, which makes it the tallest bike I've ever seen or heard about.
It could use some cleaning and lubing, and maybe some modern component upgrades, but if you need a bike this tall, there are few options. This one, as is, for $1000 or reasonable offer.