For the 2017 tax year, the “soft” appeal called a Request for Reconsideration (RfR) has been moved back to various dates February 15th, February 21st, or February 28th, etc.
If you miss this filing date, you can still protect your rights and launch a “hard” appeal with the Assessment Review Board (ARB) by March 31st, 2017. The fee is $300 for non-residential properties.
There is no fee for the RfR.