Private cities and autonomous communities: lessons

On Roatán, an island off Honduras's Caribbean coast, the promise sat on the front page: lock in today's taxes and regulations for life, because "we can't change it without your consent." Anyone opening a business there could opt into the rules that best suited them. This was Próspera, the best-known experiment in governance designed before the residents arrive.

On September 20, 2024, the Supreme Court of Justice of Honduras declared unconstitutional the regime of Zones for Employment and Economic Development (ZEDEs) on which the project rested. The ruling was retroactive, as the Charter Cities Institute reported. The operator was already pursuing an international arbitration against the country, registered with ICSID on February 3, 2023, and still pending.

A contract proves consent. Only the law proves permanence. The distinction matters to anyone who develops or manages high-end communities in Brazil: private governance can organize coexistence, prevent conflict and protect value, but it cannot replace sovereignty or public law.

Frontier laboratories test a simple idea: the rules arrive before the residents

The Seasteading Institute, an American nonprofit, was formally established on April 15, 2008. The idea came from Wayne Gramlich and Patri Friedman, and the seed money from Peter Thiel, according to the organization's own history. Its mission is to enable floating societies where new ideas for government can be tested. Its current agenda is more down to earth: securing a maritime flag and creating a classification society.

On dry land, the Charter Cities Institute defines a charter city as "a new city granted a special jurisdiction to create a new governance system." The network state, Balaji Srinivasan's concept, is a highly aligned online community that crowdfunds territory around the world and eventually seeks diplomatic recognition.

All three models share one premise: newcomers know the rules before they enter and accept them by choice. That premise, and only that premise, is what matters to a curated community. Sovereignty, currency and flags do not fit inside a real estate development, and Roatán shows why.

Próspera shows the limit: a private contract cannot buy sovereignty

The design was sophisticated. In late 2019, the zone hired the Próspera Arbitration Center as its default provider, authorized to decide every contractual case arising there. The center sorts claims into five tiers, from small claims of up to US$10,000 to extraordinary claims above US$5 million, reserved for senior arbiters.

What the design could not control was the layer above it. In the legal stability disclosure the group itself publishes, the operator cites two 2022 decrees through which the Honduran Congress repealed the legal foundations of the ZEDEs. It argues they cannot lawfully be applied to existing zones, yet it lists the risks: legal instability, adverse rulings, expropriation. And it warns that continued reliance on the promised stability means the knowing and voluntary assumption of the risk of loss.

Private governance organizes coexistence; it does not buy sovereignty. Whoever confuses the two shifts onto residents a risk that no set of internal rules can cover.

The arbitration invokes the legal stability agreement signed with the government and the CAFTA-DR trade treaty. The tribunal was constituted on January 29, 2024, and on September 9, 2026, it invited amicus curiae to file written submissions. The lesson is one of method: a promise of stability is only as good as the authority of whoever signs it.

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In Brazil, the micro-constitution already exists, and it is called the convention

Brazilian law offers, within the law, what frontier laboratories tried to build outside it. Under Article 1,333 of the Civil Code, a condominium convention must be signed by holders of at least two thirds of the ideal fractions. From then on, it binds everyone with rights, possession or occupancy over the units. Once filed with the Real Estate Registry, it also binds third parties.

In plain terms, someone who buys in year ten finds the rules already written and is bound by them on arrival. It is the consent Próspera promised, but with public backing. The law also lists what the convention must contain (cost sharing, management, assemblies, sanctions, internal rules) and requires two thirds of the votes to amend it. In lot condominiums, the same rules apply where relevant.

The convention asks the state to give up nothing; it occupies the space the law already reserves for private autonomy. That is why it lasts. Excellence lies in filling that space with clear, proportionate and verifiable rules, rather than copying the generic template that circulates among notaries.

Graduated sanctions separate a rule from a suggestion

A rule without consequences becomes a suggestion, and suggestions do not protect value. The Civil Code builds the response in steps. An owner who alters the facade or disturbs the peace pays the fine set in the convention, capped at five times the monthly fee.

The next step sits in Article 1,337. An owner who repeatedly breaches their duties may pay up to five times the fee, if three quarters of the remaining owners so decide. If repeated antisocial behavior makes coexistence untenable, the fine equals ten times the fee, until the assembly decides otherwise. Residents know the ceiling before any conflict. Management knows the high quorum demands preparation: evidence, records and a defense procedure.

Without a table of conduct, every case turns into a tense assembly, with a hard quorum and a high risk of being overturned. With one, enforcement stops being personal and becomes procedural. We recommend three written elements per sanction: the objective conduct, the defense procedure and the amount or calculation method within the legal cap.

A dispute needs a path before it exists

Próspera's most transferable idea is not its tax regime. It is the map of disputes, drawn before the first conflict. Brazil's Law No. 9,307/1996 allows disputes over freely transferable property rights to go to arbitration, with one decisive safeguard for adhesion contracts, which is how units are marketed at scale.

In those contracts, an arbitration clause only works if the buyer starts the arbitration or expressly agrees to it. That consent must be in writing, in a separate document or in bold type, with a signature or initials specific to the clause. Burying arbitration in a standard contract creates a clause that may fail exactly when it is needed.

The robust path is tiered. First, a recorded conversation with management. Then internal mediation with a deadline. Only then arbitration or the courts, each step with a named owner and a response time. The first two steps exist so that the third stays rare.

Access and territory: the line a curated community does not cross

Law No. 6,766/1979, since its 2017 reform, recognizes the controlled-access subdivision. The city regulates the access control, and it is forbidden to turn away non-resident pedestrians or drivers who are identified or registered. The gatehouse identifies, records and organizes the flow. It does not turn a street into a border.

The same law ties nonprofit residents' associations to the business of property management, which gives them both a role and a limit. Access rules that promise exclusivity beyond that create liability, not value.

Even the special regimes Brazil does allow are born from the state. Export Processing Zones are created by executive decree, on a proposal from states, municipalities or, since 2021, a private entity, and they only operate after customs clearance of the area. A curated community that respects this architecture gains what Próspera lost: legitimacy that survives a change of government.

Governance is living infrastructure, with maintenance and audit

Poorly maintained drainage fails. So do poorly maintained rules. The building manager serves renewable terms of up to two years. Under Article 1,348 of the Civil Code, the manager must enforce the convention, collect the fines due and render accounts every year and whenever asked. Since 2022, assemblies may be held electronically, unless the convention forbids it, provided voice, debate and vote are preserved.

Excellence goes beyond the minimum. A dashboard logging each incident, the response time and the outcome turns governance into auditable data. The annual review of the internal rules starts from evidence rather than impressions, and the assembly votes knowing which rules have become dead letters.

An outside view closes the loop. Independent review of accounts and controls, such as the work of Valida Auditoria, a group company, gives the assembly a second reading of what management reports.

Numerical example: what it costs not to design the rules

Every number below is an InnovaSphere hypothesis, built to illustrate the mechanism, not market data. Values are nominal and constant, with no interest or inflation adjustment.

Under these assumptions, explicit governance would cost R$ 282,000 less in the first year, R$ 402,000 less in each following year and R$ 1,890,000 less over five years.

The stress test shows where the result is fragile. If the design cut disputes from 30 to 20 rather than to 6, Scenario B would cost R$ 390,000 from year 2: still below A, but with a much thinner margin. The break-even point is modest. From year 2, two avoided disputes a year pay for the R$ 30,000 upkeep; in year 1, with the initial design, it takes nine. The question that remains is a different one: what does each conflict your community failed to anticipate cost you today?

When it does not pay off

• Very small communities. With few units and owners who deal with each other directly, the fixed cost of extensive internal rules and a formal mediation procedure tends to exceed the cost of the conflicts avoided. A well-drafted convention with the legal minimum is enough.
• Rules that try to replace public law. A clause that bars identified non-residents from a controlled-access subdivision, or that promises stability only the state can grant, creates liability. Próspera shows how large the risk becomes when a promise exceeds the authority of whoever makes it.
• Too many rules and no capacity to enforce them. Dozens of prohibitions that management cannot police teach residents to ignore them all. Fewer rules, objective and consistently applied, protect more than a long code that nobody owns.

Checklist: seven checks before approving your community's governance

1. Confirm with the project's lawyer that the convention includes the minimum content of Article 1,334 of the Civil Code and has been registered.
2. Map the ten behaviors that cause the most friction in the type of community you are building, with people who already run similar communities.
3. Write for each sanction the conduct, the defense procedure and the amount within the legal caps, with legal counsel.
4. Define the tiered resolution path, from recorded conversation to mediation to arbitration or the courts.
5. Verify that any arbitration clause in purchase contracts meets the adhesion rule of Law No. 9,307/1996.
6. Test every access rule against Law No. 6,766/1979 and municipal regulations, with the urban planner and city hall.
7. Schedule the annual review of the internal rules based on the incident log, plus an independent review of the accounts.

Frequently asked questions

Can a private community in Brazil have its own rules of coexistence?

Yes, within the space the law reserves for the convention and the internal rules, with minimum content, quorums and sanction caps set by the Civil Code. It cannot override public law, such as the right of identified non-residents to enter a controlled-access subdivision.

What happened to Próspera after the 2024 ruling?

The ZEDE regime was declared unconstitutional with retroactive effect. The operator maintains an ICSID arbitration against Honduras, registered in 2023 and pending, and it warns that relying on the promised stability means assuming the risk of loss.

Can arbitration be mandatory for all residents?

In adhesion contracts, the buyer must expressly agree, in writing, in a separate document or in bold type, with a specific signature or initials. Internal mediation with a deadline and a named owner is the first filter before any clause comes into play.

What is the highest fine for antisocial behavior?

Article 1,337 of the Civil Code provides for a fine of ten times the condominium fee when repeated antisocial behavior makes coexistence untenable, until the assembly decides otherwise.

How many rules should a community rulebook contain?

There is no legal number. The test is enforceability: each rule needs objective conduct, someone responsible for monitoring it and a defined consequence. The simulator in this article uses conflict rates that are hypotheses to be calibrated against each community's history.

Legal basis

• Civil Code (Law No. 10,406/2002), Articles 1,332 to 1,334: creation and content of the convention.
• Civil Code, Articles 1,336 (paragraph 2) and 1,337: fines for breach and antisocial behavior.
• Civil Code, Articles 1,347, 1,348, 1,350, 1,351 and 1,354-A: building manager, accounts, amendment and electronic assemblies.
• Civil Code, Article 1,358-A (paragraph 2): lot condominiums.
• Law No. 9,307/1996, Articles 1 and 4 (paragraph 2): arbitration in adhesion contracts.
• Law No. 6,766/1979, Articles 2 (paragraph 8) and 36-A: controlled access and residents' associations.
• Law No. 11,508/2007, Articles 1 and 2, as amended by Law No. 14,184/2021: Export Processing Zones.