You can go to the Riverhead Assessors Office located at 210 Howell Ave Riverhead, NY 11901 or call them at (631) 727-3200. Provide the Assessors Office with the property address, or Tax Map ID if you have it, and they can provide you with tax information. Be sure to ask for the "True Taxes" to get the whole tax bill amount (without exemptions/tax reductions such as STAR, Veterans, etc.). Should you want additional information such as a survey (if they have one on file) you will need to go down in person to fill out the Freedom of Information Act form. With this form you can request surveys, building permits, CO's, etc. Good luck!