While browsing the Rome board, I kept wanting a consistent price-per-square-metre filter. It would make local comparisons easier and cut down on repeated questions in valuation threads and market reports. I can see three approaches: a required field when posting, a tag, or a search filter based on structured property details. My concern is friction. Casual members should still be able to start a thread quickly, especially on mobile. Which approach would give useful results without turning the posting form into a questionnaire?