We accept AMEX, Visa, MasterCard, check or cash.

Once all of the above has been submitted, non-expedited applications may take up to 7 business days to process. Please note, if any of the requirements are missing in the form or invoices, it will prolong the processing time. For more information, please email us at certificate@wtcdenver.org or call us at 303-592-5760.

If you are having issues submitting your online application, you may click here to download an editable Word version of a Certificate of Free Sale application.

You may then email it to certificate@wtcdenver.org or send it by standard mail to the Certificate Team:

World Trade Center Denver c/o Certificate Team
2650 E. 40th Avenue, Denver, Colorado 80205 USA