had been remaining
-había estado permaneciendo
Past perfect progressiveconjugation ofremain.There are other translations for this conjugation.

remain

These buildings are urban regenerators, stir his environments into action exceeding his physical limits, revitalizing neighborhoods that had been remaining obsolete, attracting a new industry it cleans and with added value.
Estos edificios son regeneradores urbanos, dinamizan sus entornos sobrepasando sus límites físicos, revitalizando barrios que habían ido quedando obsoletos, atrayendo una nueva industria limpia y con valor añadido.
The abbey had been remaining in ruins until the Baroness of Rothschild bought it by the end of the XIX century.
Se quedará en ruinas hasta su rescate al fin del siglo XIX por la Baronesa De Rothschild que salvó lo que queda de la iglesia y restauró una partida de las construcciones.
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