BLOXHUB
For the built environment

Your urban challenge does not have a solution problem. It has a co-responsibility problem.

The hardest city problems aren't solved by single actors. They're solved by constellations of public, private, civic and academic actors working as one.

The model — C³

So we built C³.

A BLOXHUB model for co-responsibility.

  1. C¹

    Curate

    Select the specific public, private, civic and academic actors the challenge needs.

  2. C²

    Co-create

    Get them working as one set — shared definition, transparent incentives, joint risk.

  3. C³

    Co-responsibility

    The network stays accountable to each other long after we leave.

Case 01 · Active 2026HafenCity, HamburgCase 02 · Brief incomingTacoma, WashingtonCase 03 · Sept 2025The Copenhagen Way
ACTOR FIELD
The C³ method, performed

Watch the field compose itself into a collaboration.

01 — The disconnected field

All the capability already exists. But only some are connected.

Every challenge is surrounded by people who can move it: regulators, financiers, residents, researchers, developers and public institutions. They are already in the city. But they rarely meet early enough, with the right mandate, the right incentives and a shared structure for acting together.

02 — C¹ Curating

Building the right room

The right actors are rarely brought together early enough. BLOXHUB identifies the public, private, civic and academic actors with the mandate, capital, knowledge and delivery capacity to move a specific challenge. The point is not to gather everyone. It is to bring together the right people, early enough, around a shared purpose and a structure for action.

03 — C² Co-creation

Structuring shared action

A room becomes useful when responsibility starts to move. BLOXHUB helps the actors turn a shared challenge into shared work: a precise problem definition, transparent interests, co-designed solutions and risk carried by more than one organisation. This is where connection becomes capacity.

04 — C³ Co-responsibility

Making the alliance hold

Co-responsibility begins when the work no longer depends on us. The actors stay accountable to each other through clear roles, shared ownership and a structure that can carry the work forward. So the next decision, investment or crisis is met by an alliance that already knows how to act.

That was the method. Next 3 specific cases.

Urban challenges need more than plans. They need co-responsibility.

The hardest city problems aren't solved by single actors. They're solved by constellations of public, private, civic and academic actors working as one.

Case 01HafenCity, Hamburg
Case 02Tacoma, Washington
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Co-responsibility in action

Proof of concept not a blueprint

Each case is an urban challenge being solved by curating the missing constellation of actors. Choose a city to explore the work.

Pick a city to begin

The thinking · Behind the method

Four pieces of thinking behind co-responsibility.

Read everything
Publication2024

The Copenhagen Way

BLOXHUB's manifesto on why this is a critical moment for European cities — and why curated co-responsibility, not bigger toolkits, is the way through it.

  • Europe's urban challenges are interlinked: climate, housing, inequality and trust cannot be solved in silos.
  • Public, private, civic and academic actors must share risk and reward, not just the room.
Read in full
Report2024

Building Equity

Housing as a key to a low-carbon society. A pan-European whitepaper convening industry, NGOs and policy on how to decarbonise the building stock without deepening the housing crisis.

  • 10.6% of Europeans in cities are overburdened by housing costs while the EU's carbon budget for buildings runs out within a decade.
  • Decarbonisation and affordability are treated as competing agendas — they must be solved as one.
Read in full
Research2023

The Right to Housing

Mazzucato and Farha's working paper for the Council on Urban Initiatives: realising the right to housing requires pairing legal accountability with mission-oriented economic policy.

  • Housing is the foundational human right that unlocks health, education, security and participation — not a commodity.
  • Human-rights accountability and mission-oriented policy reinforce each other: one sets the obligation, the other organises whole-of-government delivery.
Read in full
Report2026

The Nordic Way

Ramboll's pathway for Helsinki, Stockholm, Oslo and Copenhagen to move from parallel city strategies to coordinated regional action — built on 103 senior leaders convened across the four capitals.

  • Urban resilience is a decisive economic driver — associated with nearly one percentage point higher annual GDP growth.
  • Adaptive governance, new public-private financing models and neighbourhood-scale placemaking are the three shared priorities across all four capitals.
Read in full
The payoff

Co-responsibility is what your challenge is missing. Let BLOXHUB convene it.

Submit your urban challenge. We'll review it and come back with an initial read on which sectors and actor types your city likely needs.

Or reach out directly

Prefer a quick conversation?

Ditte Vind Lysgaard
Ditte Vind Lysgaard
Chief Science and Innovation Officer
Christoffer Worm Nielsen
Christoffer Worm Nielsen
International Manager
Contact us →