How do I write my Ancre address on the Registraire des entreprises form?

Your address is declared as follows: 3737, boulevard Crémazie Est, suite 402, box 402-A184 (your number), Montréal (Québec) H1Z 2K4. The box number goes in the address supplement field or on the suite line, never in the P.O. box field. You can use the same address as both registered office and correspondence address, which makes tracking official notices simpler. Ancre's welcome kit lays out these lines exactly as the REQ expects them.