Curb-Space Underwriting: The Parking Count That Tells You Whether a Triplex Is Priced Right

Most triplex pro formas treat parking as a footnote. The rent roll gets a line, the maintenance reserve gets a line, and the curb gets nothing. That omission is expensive. In many American markets, a tenant signs a lease with a mental image of a reserved spot, a short walk to the door, and a place for a second vehicle. When that image collapses, the unit may still be habitable, but it becomes harder to lease and easier to discount.

Parking deserves its own underwriting page. Not because every triplex needs a garage, but because parking capacity is a silent multiplier on rent, turnover, and resale value. The work is to count three different kinds of parking before the purchase contract is signed.

The First Ledger: Legal Parking

Begin with what the law and the deed actually permit. A paved rectangle is not automatically a parking space. Check the zoning code, the certificate of occupancy, and any recorded site plan. Some municipalities count a driveway apron; others do not. Some allow tandem spaces; others cap the number of vehicles per dwelling unit regardless of pavement.

A triplex near a university may sit in an overlay district with minimum parking requirements that were written for single-family homes. A converted building may have a legal nonconforming status that permits three units but not three additional curb cuts. These details belong in the due-diligence file, not in a conversation after closing.

The legal ledger also includes easements. A shared driveway is common among triplexes, especially where a rear lot was subdivided or a former single-family carriage house was adapted. Read the easement language for maintenance obligations, width restrictions, and whether one owner can block another. An easement that exists on paper but has been ignored for a decade is a dispute waiting for a new owner.

The Second Ledger: Practical Parking

Practical parking is what a driver can actually use on a Tuesday night. It accounts for turning radius, snow storage, trash bin placement, and the difference between a space that fits a sedan and one that fits a pickup. A tandem arrangement that looks generous on a survey may require one tenant to move a car every time another tenant leaves for work. That is not parking capacity; it is a daily negotiation.

Measure the approach. A triplex on a narrow lot may have three legal spaces but only one practical way to enter them. Backing onto a busy arterial is different from backing onto a quiet residential street. If the driveway slopes, ice becomes a seasonal variable. If the alley is unpaved, drainage becomes a spring variable.

In Buenos Aires, the curb is often treated as a shared and negotiated resource, with garage access and street parking folded into the rhythm of the block. American triplex investors cannot import that informality wholesale, but they can borrow the habit of observing how a street actually works before assuming a space will perform as drawn.

The Third Ledger: Tenant-Perceived Parking

Tenants do not read site plans. They count what feels available. A unit advertised with "parking" may be judged by whether a guest can park nearby, whether a delivery driver can stop without blocking the driveway, and whether a second vehicle has a plausible home. This perceived capacity drives applications and renewal decisions more than the legal count does.

Street permits matter here. Some cities issue residential permits by address; others limit them by zone or household. A triplex in a permit-parking district may offer legal off-street spaces while the surrounding blocks are restricted after 6 p.m. That combination can be fine for one household and miserable for three. Call the parking authority. Ask how many permits a three-unit address can obtain and whether commercial vehicles are excluded.

EV charging is now part of the perception layer. A triplex without a dedicated charger is not obsolete, but a triplex where the only outlet is a shared hallway receptacle invites extension-cord improvisation. If the property has a garage, determine whether a Level 2 charger can be added without upgrading the service. If charging is impossible, price the unit accordingly rather than promising something the electrical panel cannot deliver.

What Parking Does to the Numbers

Parking capacity affects three financial outputs: rent, vacancy risk, and appraisal value.

Rent is the most direct. In markets where off-street parking is scarce, a dedicated space can support a premium. In markets where street parking is abundant and permits are cheap, the premium shrinks. The error is to apply a parking premium from one neighborhood to another simply because both are near transit.

Vacancy risk is subtler. A unit with awkward parking may lease quickly in summer and sit empty in winter. It may attract tenants who do not own cars, which is fine until the next turnover, when the applicant pool changes. Parking is a filter on the tenant pool, and a narrow filter can lengthen days on market.

Appraisal value is where parking becomes institutional. An appraiser may adjust for garage spaces, driveway capacity, or a documented parking easement. If the parking is informal or legally ambiguous, the adjustment may be zero even when the market pays for it. That gap matters at refinance. A triplex that trades at a premium because of parking should have the parking documented as clearly as the rent roll.

A Pre-Offer Checklist

Before making an offer, complete a curb audit on foot and on paper.

• Confirm zoning and certificate-of-occupancy parking requirements for a three-unit building.
• Count legal spaces from the recorded site plan, not from the listing photos.
• Test each space with a mid-size vehicle at the time of day when tenants would use it.
• Read every driveway easement for maintenance, width, and obstruction language.
• Ask the parking authority how many residential permits the address can obtain.
• Inspect the electrical service for future EV charging and note any panel limitations.
• Identify where snow will be piled and whether plowing blocks any space.
• Ask the seller for a history of parking complaints, towing, or neighbor disputes.

Lease Clauses That Prevent Shared-Driveway Disputes

Parking problems often surface as neighbor disputes rather than tenant complaints. A lease can reduce that risk without overreaching. Assign spaces by unit where possible. State whether tandem parking requires cooperation and how much notice is expected. Clarify that a driveway easement is not a storage area for trailers, boats, or unregistered vehicles. If street permits are required, put the obligation on the tenant and provide the application information at move-in.

For shared driveways, include a maintenance clause that mirrors the easement. If snow removal is split, say so in plain language. If one unit has the right to block a space for moving day, define the window. Vague language invites the kind of conflict that ends up in a landlord-tenant file.

The Curb as an Asset

A triplex is a small portfolio of doors, and every door comes with a household that owns vehicles, receives deliveries, and hosts visitors. The curb is part of the property even when the property line ends before it. Underwriting parking is not about demanding a garage. It is about counting honestly: what is legal, what is practical, and what a tenant will believe on the day they sign.

When those three ledgers agree, parking becomes a quiet advantage. When they disagree, the spread shows up as a discount, a vacancy, or a dispute. Either way, it belongs in the file before the offer, not after the first snow.