The phrase "affairs are built" is correct and usable in written English.
It can be used in contexts discussing the development or establishment of relationships, organizations, or situations.
Example: "In the world of diplomacy, strong alliances are essential because affairs are built on trust and mutual respect."
Alternatives: "relationships are formed" or "connections are established."
But we don't need to say that the state of affairs is built up out of the referents of the words in the sentences.
The White House could argue, as Mr Clinton did in his grand jury deposition, that the Jones case was a bogus lawsuit fuelled by right-wing money, and that the case built against him by Kenneth Starr, the independent counsel, over the Monica Lewinsky affair is built entirely on this unsound foundation.
When schools are built, they destroy them, and some neighboring countries are interfering in our affairs.
"The Six Nations is a dour affair and is built on the foundation of not allowing the opposition to score points," he said.
(One exception is Hayward's old city hall, a bulky, beautiful Art Deco affair that was built directly atop the fault in the nineteen-thirties and had to be abandoned permanently in the sixties after creep rendered it unusable).
No progress in human affairs will ever be built on the blood of innocent people".
("Dr. Laighton and I had made enough money to take a house for ourselves, a four-story affair which had been built for Rose Coghlan, the great actress, on a side street off Central Park").
In Le Val Fourré the mosque, a handsome affair by any standards, was built by Saudi Arabia, and for a while, until the French intelligence service "organised a change", had a fundamentalist imam.
Six months had passed since Helen had discovered that he was having an affair, and their current détente was built on the understanding that he would never again be able to speak freely.
Since being bitten by the civic bug during the redevelopment battle, Cheyovich has counted herself among an informal group of six or seven City Hall watchers who refer to themselves as "the watchdogs" and whose friendship is built around civic affairs.
