Common-interest ownership glossary

A cooperative resident owns an entity interest and occupancy rights, not a condominium unit deed

The building can look exactly like a condominium. The title structure, governing documents, financing collateral, and transfer process reveal the difference.

Last updated: August 1, 2026

Cooperative: definition first

Direct answer: A housing cooperative, or co-op, is a common-interest ownership structure in which a corporation, trust, or similar cooperative entity holds title to the real estate. A resident buys shares, stock, a membership certificate, or another ownership interest in that entity and receives the right to occupy a particular unit through a proprietary lease or occupancy agreement. The resident generally does not receive separate fee title to the unit.

Why it is on the exam: PSI includes cooperatives and condominiums among common-interest ownership forms in Property Ownership. Fannie Mae's current co-op guidance distinguishes a share loan secured by the borrower's cooperative ownership interest and assigned occupancy rights from a mortgage secured by a condominium unit. Illinois's Residential Real Property Disclosure Act includes units in residential cooperatives within its covered property definition, subject to the Act and exemptions.

Real estate title

Held by cooperative entity

Resident owns

Shares or membership interest

Occupancy document

Proprietary lease or agreement

Typical resident loan

Co-op share loan

Compare the documents and collateral, not the hallway

Decision point	Cooperative	Condominium
Who holds project title	Co-op corporation, trust, or entity	Unit owners separately own unit interests; common elements are shared
Resident receives	Shares or membership plus proprietary lease or occupancy agreement	Deeded unit interest plus inseparable common-element percentage
Individual financing	Share loan secured by ownership interest and occupancy rights	Mortgage or other lien secured by the unit interest
Shared obligations	Monthly charges support entity expenses and possibly blanket debt	Assessments fund association common expenses under condominium documents

Follow title from the building to the shareholder

The cooperative entity owns the land and improvements. The buyer acquires the ownership package defined by stock, membership, bylaws, subscription or purchase documents, and a proprietary lease. The lease links specified shares to the exclusive right to occupy a particular unit, subject to its conditions.

Because the resident's asset is not a standard condominium deed, title search, lien perfection, transfer documents, and financing follow the cooperative structure and applicable state law. A marketing phrase such as buy this apartment does not change the legal collateral.

Confirm the entity that owns the real estate.
Identify the shares or membership tied to the unit.
Read the proprietary lease or occupancy agreement.
Review bylaws, transfer approval, charges, reserves, insurance, and project debt.

Read monthly charges and project debt together

A cooperative's monthly charges can support operating costs, maintenance, insurance, taxes, reserves, utilities, and debt service according to the project's budget and documents. The corporation may have a blanket mortgage on the property in addition to residents' individual share loans.

That entity-level debt matters because the real estate stands behind the corporation's obligation. A buyer and lender review payment history, financial statements, reserves, litigation, owner occupancy, delinquencies, insurance, and blanket financing rather than analyzing only the interior unit.

Transfer and financing depend on the cooperative documents

Co-op documents can require board or entity approval of a purchaser, assignment of the proprietary lease, transfer of the related shares, fees, financial qualifications, and compliance with transfer restrictions, subject to fair housing and other law. The seller transfers the cooperative package rather than signing a deed for a separately owned unit.

Fannie Mae describes a co-op share loan as financing the borrower's ownership interest and accompanying occupancy rights. Its collateral includes the shares or equivalent ownership evidence and an assignment of the proprietary lease or occupancy agreement. Project eligibility and lender approval remain separate from a student's definition of the ownership form.

The buyer asks for the unit deed

Question: A buyer purchases 200 shares in a housing corporation and receives a proprietary lease for Apartment 7. The corporation owns the building. What real estate interest does the buyer ordinarily receive?

Best answer: The buyer receives the cooperative ownership interest and occupancy rights, not a separate condominium-style deed to Apartment 7.

Why: The corporation holds the real estate title. The shares and proprietary lease form the resident's ownership and occupancy package. A share loan, transfer approval, and monthly obligations follow that structure.

Lock in the distinction

Exam trap

Do not call the proprietary lease an ordinary landlord-tenant rental while ignoring the resident's shares. Also do not call the shares a deed to the physical unit. Both documents work together in the cooperative structure.

Memory cue

Co-op: company owns the property, owner buys shares, lease supplies the unit right.

Quick questions

Does a cooperative resident own the apartment?

The resident generally owns shares or a membership interest in the entity and holds occupancy rights to the unit. The cooperative entity owns the real estate.

What is a proprietary lease?

It is the cooperative document that grants the shareholder or member the right to occupy a specified unit, subject to the co-op's terms.

How is a co-op purchase financed?

An individual borrower may use a co-op share loan secured by the ownership interest and assigned proprietary-lease or occupancy rights, subject to lender and project requirements.

Do Illinois disclosure rules cover residential co-ops?

The Illinois Residential Real Property Disclosure Act includes units in residential cooperatives within its definition of residential real property, subject to the Act's scope and exemptions.

Primary sources and review status

Checked through August 1, 2026. This definition is an exam-prep explanation, not a substitute for current law or advice about a live dispute. The current official source controls if the outline or Illinois rule changes.