Found: Fiction/Scifi/Fantasy

Again don't recall the author or this would be a lot easier. I read it a few years ago, but I believe it was written many years before. I remember very little of this story, but a man in a modern day responds to a want ad for like an accountant or something, and when he reaches the address and goes inside, he is transported to an olde kingdom with horses and castles, and he has to manage the place. I can't remember if it's managing the whole kingdom or just managing the finances. It was a very interesting read. Fun concept.

Magic Kingdom For Sale—SOLD! by Terry Brooks?

I'm pretty sure that's the one. Thanks!