Yeah Paris has awful production, so if you get great engineers from Rome, use them to rush wonders in Paris. If not, build them in Rome. Build theatre and weaver in Paris and start running 2 artists immediately. Build catholic church/monastery, and during a golden age after you build Versailles put a cathedral in Paris, the bonus production should be enough. Leaning tower is great, but you want it in Paris where you're GA farm is (at least that's where mine is). Paris can just build culture when you've built catholic buildings/theatre/weaver/monument. The bonus culture from Notre Dame on religious buildings will also be a boon.