The compromis fixes the deal and the price; the acte transfers title. Between them sit the diagnostics, the pre-emption right of the commune where it applies, and the bank's offer period if you finance. Weeks, not days.
The copropriété file is where a Paris purchase is won or lost. The état daté, the last three assemblée générale minutes and the fund balance tell you which works have been voted and who pays for them — the answer is the new owner.
Non-residents buy on the same terms with no extra foreigner tax, but French banks ask for more equity and a settlement account. Paris applied the 2025 DMTO uplift, so confirm the rate on your own acte.