Why does Howard Roark destroy the public-housing project in The Fountainhead?

In Ayn Rand's novel The Fountainhead, the protagonist Howard Roark destroys the public housing project he designed because government bureaucrats altered his architectural plans against his wishes.1

Roark’s act is a manifestation of his unwavering commitment to his own integrity and individual vision, which he refuses to compromise for the sake of collective or bureaucratic demands. By destroying the building, he rejects the subordination of his creative work to the whims of others. During his subsequent trial, Roark defends his actions by arguing for the supremacy of individualism over collectivism and egoism over altruism, ultimately leading to his acquittal by the jury. This narrative serves as a central exposition of Rand’s philosophy of objectivism, which posits that the suppression of individual creativity is a fundamental evil.12