When a family reaches the point where coordinating wealth has become its own full-time problem, the question of structure becomes unavoidable. Do you build something exclusively for your family, or do you access a platform built for several families?

This is the choice between a single-family office and a multi-family office, and it comes up more often than it used to, because the asset levels at which the question becomes relevant have shifted downward. Families that would have defaulted to a private banking relationship a decade ago are now seriously evaluating both options.

The right answer depends on complexity, capital, and culture. It doesn't depend on which option sounds more prestigious.

The single-family office

A single-family office is a private entity set up exclusively to serve one family. Staff are employed by the family. Systems are built around the family's specific needs. Every function, from investment management to tax planning to lifestyle coordination, is handled by people whose only client is you.

The genuine advantages are full customization and complete privacy. There is no shared infrastructure, no service model designed for a composite client, no competing priorities from other family relationships. The team develops deep familiarity with the family's history, values, and objectives in a way that an external firm, no matter how good, rarely replicates.

The honest trade-offs are cost and talent. Running a single-family office properly costs between $2 million and $10 million annually for most operations, depending on scope and headcount. Attracting and retaining top-tier specialists, a genuinely strong CIO, a legally sophisticated general counsel, an investment analyst who could work at a fund, is difficult when you're one client. The best talent tends to want institutional environments with peer learning, career progression, and competitive compensation benchmarked against the market.

Most advisors suggest the economics of a single-family office become rational somewhere above $500 million in assets. Below that, the overhead as a percentage of AUM becomes a meaningful drag.

The multi-family office

A multi-family office serves several unrelated families under one operating platform. The infrastructure, the specialist team, the technology, and often the compliance framework, is shared across clients. Each family's work is segregated and confidential, but the cost of building and maintaining the operation is distributed.

The genuine advantages are access and efficiency. A well-run multi-family office can afford specialists that no single-family office at a comparable asset level could sustain on its own: a deeper investment team, broader legal expertise, more sophisticated technology. And the economics work at lower asset levels, typically from $30 million upward, because the fixed cost of the operation isn't borne by a single family.

The honest trade-offs are customization and culture. Even the best multi-family offices operate within a service model designed for a range of clients. The degree to which a specific family's needs can be fully accommodated varies. Some multi-family offices feel genuinely bespoke. Others feel like a private banking relationship with a different label.

The critical question when evaluating any multi-family office is what's actually shared and what's independent. Shared infrastructure is fine. Shared investment strategy or shared advice shaped by platform economics is not.

How to think about the choice

A few factors tend to resolve the decision in practice.

Asset level. Below $200 million, the economics of a single-family office are difficult to justify without exceptional complexity. Above $500 million, a single-family office becomes rational for most situations with meaningful coordination needs. In between, the answer genuinely depends on what the complexity looks like.

Complexity type. A family with operating businesses, direct investments, multi-jurisdictional estate planning, active philanthropy, and multi-generational governance has different needs than a family with a liquid investment portfolio and straightforward tax planning. The more complex the situation, the more the argument for dedicated infrastructure grows.

Appetite for managing an internal organization. Running a single-family office means being an employer, a manager of a small professional services firm, and a client all at once. Some principals find this straightforward. Others find it an unexpected burden on top of everything else they're managing. This is an honest consideration, not a weakness.

What the next generation needs. Where are they? What level of engagement do they want with the wealth structure? A family with heirs in three different cities who want digital access and transparent reporting has different infrastructure needs than one where succession is centralized.

The hybrid approach

It's worth noting that the choice isn't always binary. Some families use a multi-family office for core wealth management functions while maintaining a small internal team for governance, philanthropy, or family education work. Others start with a multi-family office and transition to a single-family office as assets grow and complexity warrants it.

The structure should fit the situation. It shouldn't be permanent because an early decision was made that hasn't been revisited.

The question underneath the question

What I notice in conversations with families evaluating these options is that the choice of structure often matters less than the quality of the governance surrounding it.

A single-family office with poor governance, unclear decision rights, and no written investment policy is not more effective than a well-run multi-family office relationship with the same family. The structure is the container. The governance is what makes the container work.

Before spending significant energy on which structure to choose, it's worth being clear on what the structure actually needs to do: integrate your advisors, provide reliable reporting, execute a clear investment policy, and prepare for transitions. The structure that does those things well, at a cost the family can genuinely justify, is the right one.