In the last will and testament, a decedent provided that the properties he leaves must not

be sold or disposed of for ten years following his death. He had real estate in his gross

estate as follows:

At the time of death - zonal value of P500,000

At the end of ten years after death:

Fair Market Value - P2,500,000

Declared value in the estate tax return - P1,500,000

Zonal Value - P3,000,000

How much is the gross estate of the decedent?