Ms. Pommer, whose home was seized in January, did not attend the hearing because of health reasons and to avoid the news media, Mr. Sablatnig said. The court is Austria’s highest body for constitutional matters, but Mr. Sablatnig said Ms. Pommer could appeal to the European Court of Human Rights or to an Austrian court with the aim of increasing her compensation for the home.

Hitler was born inside the complex, in Braunau am Inn, near the Austrian-German border — on April 20, 1889, in an apartment his parents had rented above a tavern on the first floor. Fearing that the structure would become a site for Nazi glorification, the Austrian government assumed its main lease in 1972.

Officials have tried to buy the building from Ms. Pommer on numerous occasions since 1984, but she has refused to sell, even when her last tenants left in 2011 after she forbade renovations. After negotiations to buy the building stalled last year, the government passed the law permitting it to be seized.

Gerhard Lebitsch, the lawyer representing Ms. Pommer, argued that expropriation should not have been allowed for reasons of public interest, as the home’s appeal as a pilgrimage site would remain even if the property changed hands.

“A concrete purpose of expropriation is missing,” Mr. Lebitsch said just before the hearing last week. “The Austrian legislature has no concrete plans for a use of this house. The Republic of Austria rents the building for 45 years now; it would have been easily possible for the renter to practice a reasonable use in the past years and decades.”