The phrase "purpose of the building" is correct and usable in written English.
You can use it any time you are referring to what the building is used for. For example: "The purpose of the building is to provide affordable housing to low-income families."
"To change the design and the purpose of the building will cause substantial delays".
Unless Sacyr is unusually saintly, it is likely that its desire for profit will sometimes conflict with the public purpose of the building.
She looked at the name rather than at the men, whose slouching or reclining postures were such a contrast to the old purpose of the building and the rush of the crowd coming out of the subway.
"But that core purpose of the building is still there: that shared area where people can delight in learning – and in this case, find an outlet for their expression.
The actual purpose of the building becomes clearer once they step into the courtyard, where three clusters of large, four-sided white statues of the former Uttar Pradesh chief minister Mayawati, the Bahujan Samaj Party founder Kanshi Ram and Buddha greet visitors.
This pilgrim, Mr. Rose writes, cannot find the front door (which may look no different from the back door), and when he does, he is likely to wind up in a lobby that gives no clue to the purpose of the building.
"What is the educational purpose of the buildings?
The purpose of the buildings along the west end of the north range is uncertain.
In 1897 a popular book reported that nobody could remember the purpose of the buildings and that and an 1850 investigation had failed to uncover their origins.
But one result of this was an overinsistence upon straight lines, even where they were not needed or where they actually defeated the functional purposes of the building.
The congregations who come for these, the real purposes of the building, should remember that Jesus talked to publicans and tax collectors.
