Thank you ! That was fast ;)
So I beat my previous score with 1990 now.
Currently, the best strategy seems to make a line of factories surrounded by shops. Factories are the only building (with the cafe I guess) that don't suffer penalties for being crowded, and they are the one with the greater bonus, as they give +3 points to each shop around. Placing a Factory double tile easily give me 100+ points, and the maximum I could achieve with one placement was 349 point.