Como foi encontrado por user45049 aqui , o livro é Dragon Fall de Lee J. Hindle.
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"It started late one saturday night after he got home from a rock concert. Something grabbed him from behind. Something wanted to hurt him. Then the voices began. Threatening. Warning. Vicious. At first he thought it was his imagination. Gabe had an excellent imagination. He used it to design monsters. Five-foot-tall, red eyed, jagged toothed monsters. The kind that sold to toy stores for big money. But Gabe isn't thinking about money right now. Because a night alone is turning into a night of terror. He is looking at the worst nightmare his mind ever imagined. And they're coming to tear his flesh...Now...Right now!
Eu entendi errado o aspecto da cadeira, mas são os monstros e as escadas.
A história de como o romance surgiu é realmente interessante. Hindle venceu um novo concurso da YA veiculado pela Avon / Flare em 1983, iniciando sua entrada de 109 páginas três semanas antes do prazo final.