Overnight stay in separate apartment. I live in a separate town but occasionally I work in the town my wife is in and the house is divided into two apartments does it nullify the separation of I stay in the separate apartment for one or two nights.
This likely will not start over the one-year separation period if it is a separate apartment, especially if it is a separate address and it is only from time to time. Regularly spending the night there, even if it’s 1-2 nights a week but it occurs every week, could make it more difficult to prove that the separation has lasted an entire year without resumption of the marital relationship.
However, to be completely sure, the best option is to not stay there at all.