Cuenta especial
Special account · Escrow-style account
The separate bank account into which off-plan payments must be paid, kept apart from the developer's other money.
The LOE requires stage payments for homes under construction to be paid into a special account at a credit institution, separate from the developer's other funds, and used only for building the project. The contract and the developer's advertising must name the account and the guarantor.
It is not a blocked escrow in the strict sense: the developer can draw on it for construction costs. What protects you is the combination of the account and the guarantee covering every amount you pay.
Source: BOE: Ley 38/1999 de Ordenación de la Edificación (consolidated)