TL;DR: In practice, no. Almost all property in Buenos Aires is priced and paid in US dollars, and has been since the 1970s. Pesos can legally be used by agreement, but the market runs on dollars, and for a foreign buyer dollars are simpler, safer, and expected.
This is the third question foreign buyers ask, after "is it safe" and "can the government seize it." Here is the straight answer.
Yes, by agreement. Since the Milei-era reforms, parties are free to negotiate currency, and pesos, dollars, and even crypto can be used by mutual consent, especially in rentals. But for a property purchase, the seller will almost always expect dollars, and a foreign buyer almost always prefers them. Trying to insist on pesos for a purchase is swimming against the entire market.
Do I need to bring physical cash dollars? No. You move funds through a formal route into a local account, opened remotely in as little as 48 hours. No duffel bags.
Is paying in dollars legal for a foreigner? Yes. It is the market standard, and structured properly it keeps your title clean.
Could a future government force peso pricing? The market has priced in dollars through five decades and many governments. Dollar pricing has proven extremely durable.
Buenos Aires real estate is a dollar market. You can technically agree to pesos, but you almost never will, and as a foreign buyer you would not want to. Plan to buy in US dollars, bring them in through a formal, documented route, and let the multiple-exchange-rate system work in your favor rather than against you.
The currency question is really the funding question, and it is one of the first things we solve for a foreign buyer. The first call is free, and we will map the most efficient, fully legal route for your dollars.
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Thirty minutes. Free. In English. We answer everything in this note plus everything not in it.