Cost, Comparison & the Models
Lean vs Single vs Multi Family Office: Which Model Fits
The three family office models — single, multi, and lean — compared on cost, control, and ownership. Which one fits your wealth, complexity, and priorities.
Overview
The three main family office models are the single-family office (a dedicated in-house team), the multi-family office (shared across several families), and the Lean Family Office (coordination owned by the family without a full staff). They differ on cost, control, and ownership. The right one depends on your wealth, complexity, and how much you want to own versus outsource.
Most comparisons pit single against multi and stop there. That leaves out the model that fits the largest group of families — those above a wealth platform but below a staffed office.
What are the three family office models?
The three models are distinguished by who staffs the office and who owns the result. A single-family office (SFO) is a dedicated team employed by one family. A multi-family office (MFO) is a firm serving several families from a shared team. A Lean Family Office (LFO) coordinates external specialists through a small owned function, giving the family the office without the payroll.
Each solves the coordination problem differently. The SFO owns the whole institution. The MFO rents access to a shared one. The LFO owns the coordination and the data while renting the specialist depth. The trade-offs follow from that difference.
How do they compare?
| Single-family office | Multi-family office | Lean Family Office | |
|---|---|---|---|
| Staffing | Dedicated in-house team | Shared across families | Small owned core + fractional specialists |
| Relative cost | Highest (~$3M+/yr) | Moderate, cost-shared | Lowest (5–10% of SFO) |
| Control | Complete | Limited; shared priorities | High; family-owned |
| Customisation | Full | Standardised | Family-shaped |
| Data ownership | Family | Often the MFO | Family |
| Key person risk | Concentrated in the team | Diffused across the firm | Reduced by the system |
| Best for | $250–500M+, complex, wants own institution | Wants a ready-made team, will accept standardisation | Above a platform, below a staffed office, wants ownership |
(Cost figures: SFO per J.P. Morgan/UBS benchmarks; 5–10% is a Circle 26 proprietary figure — confirm.)
When does each model fit best?
A single-family office fits best above the $250–500 million threshold, or where operating-business-like complexity justifies full-time in-house staff — the case made in when a single family office is right. A multi-family office fits a family that wants a ready-made, credentialed team immediately and will accept a more standardised service to get it.
A Lean Family Office fits the large middle: families whose wealth has crossed the complexity line but who cannot justify — or do not want — a staffed institution, and who value owning their picture. It is the model built for the families the other two under-serve.
The Lean Family Office is built for the families too big for a platform and too small for a staffed office.
The trade-off at the heart of the choice
The choice comes down to a triangle of cost, control, and convenience. A single-family office maximises control at the highest cost. A multi-family office maximises convenience by sharing a team, at the cost of some control and ownership. A Lean Family Office aims to keep control and ownership while cutting cost, at the price of building and running the system rather than buying it ready-made.
There is no free corner. Every family trades one of these for the others. Naming which you are willing to trade is the fastest route to the right model.
How do you decide?
Decide by ranking cost, control, and convenience for your family, then matching the model that protects your top priority. If control and ownership rank highest and the wealth doesn't justify a full institution, that points to Lean. If convenience ranks highest, an MFO. If you have the scale and want your own institution, an SFO. The comparison pillar walks the decision in more depth.
Frequently asked questions
What is the difference between a single and multi family office?
A single-family office is a dedicated team employed by and serving one family, offering maximum control and customisation at the highest cost. A multi-family office is a firm serving several families from a shared team, offering a ready-made service at lower, cost-shared expense but with less control and often less data ownership. A Lean Family Office sits between them: family-owned coordination without a full in-house staff.
What is a Lean Family Office compared to a multi-family office?
A Lean Family Office is owned by the family and coordinates external specialists through a small owned core, keeping the data and the system with the family. A multi-family office is a shared firm the family is a client of, which typically holds the system and standardises the service. The core difference is ownership: with Lean, the picture stays with the family; with an MFO, it usually stays with the firm. --- **Compare the models →**