Major Capital Improvement (MCI), defined

A Major Capital Improvement (MCI) is a substantial, building-wide upgrade in a New York City rent-stabilized building — such as a new boiler, roof, elevator, or plumbing system — that a landlord can use to apply for a state-approved increase to the legal regulated rent. The increase must be reviewed and authorized by the New York State Division of Housing and Community Renewal (DHCR) before an owner can collect it.

In plain terms: when an owner replaces a major system that benefits the whole building, the law provides a regulated, capped way to recover part of that investment through rent — but only after DHCR signs off.

What makes an improvement "major"

Not every upgrade qualifies. To be eligible as an MCI, the work generally must:

  • Benefit the entire building, not a single unit — a lobby-wide or systems-wide improvement.
  • Be a capital expense that is depreciable, not routine maintenance.
  • Replace or substantially upgrade a major building component (heating, roof, windows, wiring, elevators, pointing, and similar).
  • Be properly documented with itemized costs, paid invoices, and proof of completion.

Cosmetic touch-ups, ordinary repairs, and work confined to one apartment fall outside the definition. Improvements inside a single unit are instead handled through an Individual Apartment Improvement (IAI), which follows a separate set of rules.

How MCIs work in NYC specifically

MCIs exist only within rent stabilization, so they are almost entirely a New York phenomenon. The rules changed significantly with the Housing Stability and Tenant Protection Act of 2019 (HSTPA), which made MCI increases far more limited than they once were: the annual increase is capped at a low percentage of the legal regulated rent, phased in gradually, and generally treated as temporary rather than a permanent addition to the rent.

Because the process is application-driven, accuracy matters. An owner files with DHCR, tenants are notified and given a chance to respond, and DHCR reviews before authorizing anything. Errors, missing documentation, or ineligible line items can delay or defeat a claim — which is why building-wide upgrades in stabilized properties call for careful record-keeping from day one.

A quick example

Imagine a Bed-Stuy brownstone with rent-stabilized units where the original boiler finally fails. The owner replaces it with a new, more efficient heating system serving the whole building. Because a boiler is a qualifying building-wide capital component, the owner can document the cost and file an MCI application with DHCR. If approved, a modest, capped, phased increase may be added to the regulated rents — recovering part of the cost while keeping the building compliant and warm.

At Yak Management, MCI and IAI documentation is part of how we manage rent-stabilized and multifamily buildings across Brooklyn. We coordinate the renovation and capital-improvement work itself, keep clean records, and help owners understand what does — and doesn't — qualify before a dollar is spent.

Note: This is general information, not legal advice. MCI rules change and each building is different — consult a qualified attorney or your property manager before filing.

Related terms

Thinking about upgrades to a stabilized building? Schedule a property consultation or talk to a principal about how we handle compliance-sensitive capital work.