O'BRIEN, J.

The fee of the real property of which plaintiff is now the owner was acquired by the city of New York for rapid transit purposes and thereafter it was declared exempt from taxation. In the year 1920 the Transit Construction Commission certified that, except for a particularly described easement and right of way to be reserved by the city, it was no longer needed for transit purposes and the Commissioners of the Sinking Fund authorized its sale subject to that described easement. On October 28, 1926, it was bid in at auction by plaintiff's assignor and was afterward conveyed to plaintiff subject to retention by the city of that easement and right of way which is described in the deed by metes and bounds. October 1, 1926, was the date which fixed the taxable status for the year 1927 and the property was assessed as of that date. This action is brought to cancel the tax.

Section 4, subdivision 3, of the Tax Law (Cons. Laws, ch. 60) declares property of a municipal corporation held for public use to be exempt from taxation and accordingly the question is whether on October 1, 1926, this property was held "for public use." Prior to the conveyance by deed to plaintiff the interest which the city now holds did not exist. The Transit Construction Commission had merely certified that, except such portion of the land as is now described as within the right of way, the property was no longer required for transit purposes. The Sinking Fund Commission had authorized the sale of the whole property subject to the proposed right of way and such a sale had been effected. The municipality still owned the fee of the entire parcel. It could not create an easement in its own favor to exist during the time that it was vested with the fee. The resolution of the Transit Commission has no greater effect than a declaration that after an easement should in the future be carved out by the operation of diverse interests in the title, the remainder of the physical property would no longer be needed for transit purposes. Until such a time as the right of way might be brought into being, the city's title in fee attached to all this parcel and the land in its entirety must be deemed to be used for a subway. It is true that the surface and the space above and the space for a distance of nine feet below the surface was not physically occupied by transit structures. The land was all one property. This condition may be compared to the partial use of a building such as the cellar of a schoolhouse or any other separate space. A tract of land, for example three acres in area, all in the city's single ownership, may be physically occupied only to the extent of a single acre. In such instances the better view to take seems to be that the property must be viewed as a whole. The division or separation of the title to this rapid transit property had not occurred on October 1, 1926, and no part of the land was devoted to any purpose except that of a subway. Until the title was separated or the land divided and part of it used for some private purpose, we think the premises must be regarded in their entirety and as such all of it held for public use.

The judgment of the Appellate Division and that of the Special Term should be reversed and judgment directed in favor of the appellant canceling the tax, with costs in all courts.

CARDOZO, Ch. J., POUND, CRANE, LEHMAN, KELLOGG and HUBBS, JJ., concur.

Judgment accordingly.