Mortgage foreclosure blocked: what happens if you don't sue the third party holder

Key data

A mortgage foreclosure can be completely blocked at the Property Registry if the creditor does not sue the third party holder of the properties. This is exactly what happened to Banco Santander (successor to Banco Popular): the Llerena registrar suspended the registration of the adjudication decree, and the DGSJFP confirmed that suspension through a resolution dated March 4, 2026, published on June 17, 2026.

The case begins when Caja de España registered its ownership of the mortgaged properties before the certification of charges was issued in 2011. That moment is key: from then on, Caja de España held the status of third party holder with full registration protection. The law requires that this third party holder be sued and required to pay, not merely informed. However, notification did not occur until July 2017, four years after the 2013 adjudication decree.

What does this resolution establish?

The resolution applies the consolidated doctrine of the Constitutional Court (STC 79/2013), which requires full judicial protection of the registered holder in all mortgage foreclosures. The essential points are:

• Prior registration before the lawsuit is sufficient for the executing creditor to know of the existence of the third party holder.
• The third party holder must be sued and required to pay from the beginning of the proceedings, not merely notified in a later phase.
• A notification made four years after the adjudication decree is "clearly insufficient" to meet this requirement.
• The Property Registry acts as a legality filter: if it does not appear that the third party holder has been sued and required to pay, registration remains suspended.

Economic and operational impact

For banks and funds managing portfolios of mortgages in foreclosure, this resolution has direct consequences on asset recovery:

• Permanent registration block: Without registration, the foreclosure does not produce effects against third parties. The bank cannot freely dispose of the property or transfer it with full legal guarantees.
• Costs of retroacting the proceedings: Remedying the defect may involve restarting or expanding the judicial proceedings to include the third party holder, with associated procedural and time costs.
• Risk in NPL portfolios: Funds that acquire portfolios of mortgage credits must verify whether all registered holders were correctly sued in the foreclosure proceedings. Such a defect can significantly devalue the asset.
• Impact on real estate due diligence: Any buyer of properties adjudicated at auction must verify that the proceedings complied with this requirement before formalizing the transaction.

Who does it affect?

• Financial entities and banks that foreclose mortgages on properties with changes of ownership after the mortgage was constituted.
• Investment funds and servicers that manage or acquire portfolios of mortgage credits in foreclosure or already foreclosed.
• Third party holders (natural or legal persons who acquired a mortgaged property before foreclosure began): this resolution strengthens their protection.
• Property registrars, who must determine whether the lawsuit and payment requirement to the third party holder are on record before registering any adjudication decree.
• Lawyers and court officers who process mortgage foreclosures and must verify the registration history of properties before filing the lawsuit.
• Buyers of properties at judicial auction, who may see the registration of their acquisition compromised if the prior proceedings had this defect.

Practical example

This case is the actual real example covered by the resolution. Banco Popular (now Banco Santander) executes a mortgage. In 2011, before the certification of charges for the proceedings is issued, Caja de España has already registered its ownership of the properties at the Property Registry. From that moment, Caja de España is a third party holder with full registration protection.

In 2013, the adjudication decree is issued in favor of Banco Popular. However, Caja de España was not sued or required to pay during the proceedings. The first notification it receives is in July 2017, four years after the decree.

When Banco Santander (as successor to Banco Popular) attempts to register the decree at the Property Registry, the Llerena registrar suspends the registration. Banco Santander appeals to the DGSJFP, which in its resolution of March 4, 2026 confirms the suspension: without having sued and required payment from the third party holder, registration cannot be carried out.

What should mortgage executors do now?

1. Review the registration history of the property before filing the lawsuit: Identify whether there is any registered holder other than the mortgaging debtor who has registered their ownership prior to the certification of charges.
2. Sue and require payment from the third party holder from the start of the proceedings: It is not enough to notify them in a later phase. The lawsuit must be directed against them from the very beginning.
3. Audit ongoing or pending registration foreclosures: If there are proceedings already concluded where the third party holder was not sued, evaluate with legal counsel the remediation options before attempting registration at the Property Registry.
4. In NPL portfolios and due diligence: Include as a valuation criterion the verification that in each foreclosure all registered holders were correctly sued. Such a defect can prevent registration and reduce the value of the asset.
5. Coordinate with the procedural team: Lawyers processing mortgage foreclosures should incorporate as a standard step the prior registration consultation to detect third party holders before filing the lawsuit.

Official source

Consult complete regulation at official source

Notice: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-13160