Conservation Easements and the TDC Market in Boulder County, Colorado

Donating an easement: a multi-month process built around a real state tax credit

A landowner interested in donating a conservation easement starts by contacting Boulder County's Conservation Easement Program staff directly to have the property assessed for its conservation values -- staff then works with the landowner through negotiation, Boulder County Commissioner approval, and closing, a process that typically takes several months and must independently meet state and federal donation requirements. The easement must be donated in perpetuity to a governmental entity or a 501(c)(3) charitable organization to qualify for Colorado's Gross Conservation Easement (GCE) tax credit, which for donations made 2021 through 2026 issues a tax credit certificate worth 90% of the donated value, up to a maximum of $5 million per donation -- a dollar-for-dollar reduction in state income tax liability, not merely a deduction, administered by the Colorado Division of Conservation.

Because the credit is a state matter separate from the county's own approval process, and because Boulder County staff can't give legal, financial, or tax advice, budget for an independent appraisal and a qualified tax/legal advisor as part of any donation timeline -- the county's multi-month negotiation window runs in parallel with, not instead of, that separate state certification process.

The TDC system: selling a development right instead of only donating it

Rather than a straight donation, a landowner can generate a Transferable Development Credit (TDC) through the county's non-urban planned unit development (NUPUD) program: a base allocation of 2 TDC units per 35 acres placed under permanent conservation easement, awarded at what the county calls the "NUPUD rate." Where the land is still in active agricultural production and carries water rights that are actively applied, a 3rd unit per 35 acres is available if the landowner also grants the county an undivided interest in those water rights and commits in the easement to their continued agricultural use -- a real incentive specifically aimed at keeping working farmland in production rather than only conserving it as open space.

Those TDC units aren't just a paper credit -- the county runs a TDC Marketplace and a TDC Sales History where buyers and sellers connect, and the county describes a genuinely active market for the credits despite the program providing no price backstop or guaranteed buyer. A landowner considering this route should register with the Marketplace and review recent sales history to gauge current demand before committing to a NUPUD easement, and a buyer purchasing TDC units to increase density elsewhere in the county should confirm the units' origin and NUPUD-rate eligibility with the county's Planning Division before relying on them in a development plan.

What to ask before relying on either path

• Whether a specific conservation-easement donation has already closed on a parcel you're evaluating -- a recorded easement permanently limits what can still be built there, regardless of the raw acreage.
• Whether any TDC units have already been severed from a parcel under a NUPUD or NCNUPUD approval, which would reduce the development potential remaining on-site even if the deed shows no easement.
• For a donation, the qualified appraisal's timing relative to the multi-year GCE tax credit and any federal deduction rules, since donation timing can materially affect the credit's value.
• For a TDC purchase, current Marketplace listings and Sales History pricing, plus direct confirmation with the county that the specific units being purchased are valid and available for transfer.