SECOND BOSTON OBJECT LESSON 71 land itself. It is whatever is paid for the use of a Whole property, land and buildings, less taxes, insur ance, and repairs, and a fair interest on the value of the buildings. When new buildings, or extensive alterations are made by the tenant which are to revert to the landlord at the end of say a twenty years’ lease, then one-twentieth ofV his outlay becomes a part of the annual ground rent, because it forms a part of the price paid for use of the land. Ground rent is simply “a premium paid for the advantage of location; it is the value of the special privilege of the occupancy of a particular spot of land to all of which all men have an equal right, but from which all but one are and must be excluded.” To tax this value of land is no burden upon the user, because he can get a better living by using this land, after paying the rent, than by using some other land that nobody wants, and that hence has no rental value. The Transit Commission took the estate, northwest corner of Washington and Boylston Streets (Fig. X), by eminent domain for subway purposes,and the expert estimates of its value ran as high as $625,000, or $587 a square foot; the Commission conveyed the property back, allowing the owner as compensation for the res ervation of the basement and part of the ground floor for transit purposes, $150,000, a sum only $17,000 less than the assessed valuation of the whole estate, besides interest and an allowance of $10,000 toward necessary reconstruction of the building. While this is a very complicated case, and the owner, a well- known Boston merchant, claims that the sum received by him for damages does not compensate him fully for the diminution in the value of the estate, the facts