How Legal Diligence Saved a Buyer from Losing €50,000

When an international investor from the United States reserved a Spanish property, everything seemed ready to proceed. The reservation contract was signed, the deposit deadline was approaching, and the seller was pressing for funds.

But during our due diligence process, we noticed something critical missing, a waiver from the Spanish Administration (known as Derecho de Adquisición Preferente), a mandatory document in specific transactions. Without it, the investor risked transferring thousands of euros for a deal that couldn’t legally close.

The Challenge

Under Spanish property law, certain transactions require prior confirmation that the local or regional Administration will not exercise its right of first refusal.

This waiver is particularly important in protected housing areas (viviendas de protección oficial) or when the seller is a corporate entity subject to public oversight.

In this case, our client, unaware of the requirement, was about to transfer the full deposit to the seller. Without the waiver, the purchase could have been voided, leaving the investor exposed to losing the entire amount.

The Solution

At Paton & Mayr, we treat every reservation as a legally binding pre-contract that deserves the same level of scrutiny as the final deed.

Once our team detected the missing waiver, we immediately:
Suspended the fund transfer until the Administration’s response was verified.


Communicated with the notary and the seller’s representative to formally record the pending condition.

Advised the client to condition any payment upon receiving the waiver, preventing irreversible financial loss.

This proactive approach, though it delayed the deposit by a few days, prevented a potential six-figure loss and ensured full compliance with Spanish administrative law.

The Result

By identifying the missing waiver before funds were transferred, our client:

Avoided losing the reservation payment, which could have exceeded €50,000.

Remained fully compliant with Spanish real estate regulations.

Preserved negotiating leverage, maintaining control of the transaction timeline.

Once the waiver was issued, the purchase proceeded smoothly, with every administrative and fiscal condition satisfied.

Why Legal Representation Is Non-Negotiable

For many foreign buyers, Spanish bureaucracy is an unseen layer of risk. Documents like the derecho de tanteo waiver are rarely explained by real estate agents, yet missing one can invalidate an entire purchase.

Paton & Mayr’s real estate legal assistance ensures that no transaction moves forward until every administrative, fiscal, and legal requirement is verified. This vigilance transforms uncertainty into security, and prevents irreversible mistakes.

Carlos Paton

Partner at Paton & Mayr Lawyers

Carlos has over 20 years of experience advising foreign investors through every stage of buying property in Spanish (real estate law, conveyancing, cross-border tax structuring, and more). His team operates from Barcelona, Madrid, and Alicante. Serving clients across Catalonia, Costa del Sol, and Costa Blanca with integrated legal, fiscal, and property law services.

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