Where can I do my 90 days report in Bangkok while staying in Silom?

To perform a 90 days report in Bangkok while staying in Silom, you need to visit the immigration office located at the government complex on Chaengwattana Road. Alternatively, you can use the online 90 days reporting program if you have filed in person before, or you can mail your report. Another option is to take your passport to Bumrungrad Hospital, where they can process your 90 days report for a fee of 600 baht.