Property Tax Assessment Made after Appeal Period Expired

[Craig Lessler]

Does anyone know how property tax assessments and appeals work in Pittsburgh?

I purchased a SFR in Pittsburgh last summer and received a tax bill a couple months ago. I paid the tax bill.

On April 9, 2018, The County of Allegheny mailed a second Real Estate Tax Statement which reads "Tax Year 2018", "Taxable Assessment Increased" and nearly doubled the county property tax.

The time to file a tax period expired April 2, 2018.

However, since I was not notified of any tax assessment increase before the appeal expired, aren't my due process rights being violated?  What can I do to fight the increased assessment?