Mazowiecki Provincial office (Plac Bankowy 3/5)
Yes, it's legal, but the process would take a little longer, especially if the application is not absolutely perfect. Any paperwork submitted at Plac Bankowy has to be sent to Marszałkowska. So it would be quicker to submit it at Marszałkowska. The decision would be exactly the same, as it is the same office that is making the decision. Also, if you have any questions besides the simplest ones, the staff at Plac Bankowy are not able to answer them, but will refer you to Marszałkowska. Basically all they do at Plac Bankowy is take you application and send it on to Marszałkowska. They do not take part in the actual decision process.