white elephant

US /waɪt ˈɛl.ə.fənt/
UK /waɪt ˈɛl.ə.fənt/
"white elephant" picture
1.

elefante blanco, posesión inútil y costosa

a possession that is useless or troublesome, especially one that is expensive to maintain or difficult to dispose of

:
The old factory became a white elephant for the city, costing millions in upkeep.
La antigua fábrica se convirtió en un elefante blanco para la ciudad, costando millones en mantenimiento.
Buying that huge mansion turned out to be a real white elephant.
Comprar esa enorme mansión resultó ser un verdadero elefante blanco.