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Mariana Niro · SERHANT.
Notes from Mariana · March 8, 2026 · 7 min read

What a fifteen-year career in finance taught me about a five-month transaction.

First-person notes on the discipline that travels between a balance sheet and a closing table.

Before I sold a single property, I spent fifteen years in finance, at Credit Suisse First Boston, at Prudential Securities, at Wachovia. People assume the relevant skill that carried over was numeracy, the ability to model a return or read a market. That part helps, but it is not the part that matters most. What those years actually taught me was how to sit inside a long, consequential decision without rushing the person making it.

In finance I learned that the worst outcomes rarely come from a bad number. They come from a good decision made one step ahead of the information that should have informed it. A client who moves before the analysis is complete is not being decisive. They are being early in a way that looks like decisiveness until it does not. I carried that directly to real estate, where a five-month transaction contains perhaps four or five moments that genuinely determine the result, and a great deal of motion that does not.

The discipline, then, is knowing which moments are the real ones. The price you agree to matters, but the terms around the price, the contingencies, the inspection window, the financing structure, the closing timeline, frequently matter more, and they are where the inexperienced give away value without noticing. I treat a contract the way I once treated a term sheet: every clause is a position, and you do not concede a position simply because conceding it makes the meeting more pleasant.

Finance also taught me about counterparties. On the other side of every transaction is a person with their own pressures, their own timeline, their own definition of a good outcome. The instinct of the amateur is to win against that person. The instinct trained by years of repeat institutional business is to understand them, because the deal that closes cleanly is almost always the one where both sides got something they genuinely needed. I am not trying to defeat the seller. I am trying to engineer the conditions under which they say yes without regret.

The other inheritance is temperament around capital. I have watched clients treat a residential purchase with less rigor than they would apply to a fraction of the same sum in a managed account, simply because the asset is emotional and the setting is domestic. My role is to reintroduce the rigor without removing the feeling. A home should be loved. It should also survive a sober reading of its title, its financials, its building, and its market. Those two things are not in conflict, and a good advisor refuses to let the client believe they are.

So when I say a transaction is a five-month process, I do not mean five months of activity. I mean five months in which a handful of decisions, made calmly and in the right order, determine whether the client looks back on the purchase with satisfaction or with a quiet sense that they could have done better. My job is to make sure it is the former, and most of what makes that possible I learned long before I ever opened a lockbox.

Mariana Niro
Written by
Mariana Niro
Founding Agent · SERHANT. Miami