Relative clauses: defining
The hotel which I stay at is beautiful.
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In relative clauses:non-defining, I put the preposition before the relative pronoun or at the end of the clause.
The hotel, which I stay at, is beautiful.
or
The hotel, at which I stay, is beautiful.
Thank you.
[1] The hotel which I stay a t is beautiful. [2] The hotel at which I stay is beautiful. The defining vs non-defining contrast has no relevance in this case to the form of the relative clause.
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[1] The hotel which I stay at is beautiful.
[2] The hotel at which I stay is beautiful.
The defining vs non-defining contrast has no relevance in this case to the form of the relative clause.
[1] and [2] are both possible, though the latter is very formal.
Note that you could also say
[3] The hotel where I stay is beautiful.