Or 你住幾樓? Because we want to knew that one, not how much or how many. If you use "你住的大樓的第几层？" or "你住幾樓?" The answer will be I live on the fifth floor or tenth floor. But if you ask "你住这个大樓多少层？", this mean "How many floors are there in the flat you live." This is different.

It's both ok. But I think if you add "在" will be a bit more polite. Like "你住在这个塔楼的几层？" and if you add "请问" in the beginng of the question, it will be even more polite. Don't worry the sentence are ok to use in daily talking:D P.S. I'm more curious about the word "塔楼". I'm Taiwanese and had lived in Shanghai for 10years. I seldom hear people ues this word. We use "大楼" or “大厦” more often if you mean building. But maybe it's often use in northen ChinaXD.

Both

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