An open space easement in California is a recorded restriction a landowner voluntarily places on their property to keep it undeveloped, granted to a city, county, or qualifying nonprofit under the Open Space Easement Act of 1974. In return, the land is reassessed for property taxes based on its restricted use rather than its development potential, which on larger or higher-value parcels can cut the annual tax bill significantly. The trade-off is real: the restriction runs with the land, binds future owners, and is deliberately hard to undo.
What the Law Actually Covers
California has two separate statutes that people lump together under the “open space easement” label, and the distinction matters before you sign anything.
The Open Space Easement Act of 1974 lives at Government Code 51070 through 51097. It lets counties and cities acquire or approve easements that preserve scenic beauty, natural resources, food production, and recreation on land that might otherwise be developed.1California Legislative Information. California Government Code 51070-51073 – Open-Space Easement Act of 1974 A grant under this statute does not take effect until the local governing body formally accepts it by resolution.
Conservation easements under Civil Code 815 through 815.12 are the other track. These are granted directly to a qualified nonprofit or a government entity without a city or county approval resolution, and the Legislature has declared it public policy to encourage them.2California Legislative Information. California Code Civil Code 815 – Conservation Easements Civil Code 815 easements are typically perpetual, because the federal income tax deduction for donating one requires perpetuity.
Both types restrict development, both run with the land, and both bind every future owner. The practical choice usually comes down to who you want to work with (a local government versus a land trust), how long you want the restriction to last, and whether a federal tax deduction is part of your plan.
Who Holds the Easement
You can grant either type. The question is who receives and enforces it.
For an open space easement under Government Code 51075, the holder is a county, city, or qualifying nonprofit organization, and the deed restricts future use to preserve the land’s natural or scenic character.3California Legislative Information. California Code GOV 51075 – Definitions The local governing body has to approve the grant by resolution before the easement is effective.
For a conservation easement under Civil Code 815, the holder can be a tax-exempt nonprofit with a conservation purpose, or a federal, state, or local government entity. The broader range of eligible holders is one reason conservation easements are the more common route when a landowner wants to work with a land trust directly.
Whoever holds the easement takes on a long-term stewardship obligation: inspections, record-keeping, and enforcement, potentially forever. That is work and expense, and reputable holders will often ask for a stewardship contribution at closing to fund it.
Local Approval for Open Space Easements
Government Code 51084 requires the county or city, before accepting an open space easement, to find that preservation is consistent with its general plan and that keeping the land as open space serves the public interest. The statute lists qualifying reasons: scenic value, use as a watershed or wildlife preserve, maintaining rural character, location within a scenic highway corridor, or contribution to the livability of neighboring urbanized areas.4California Legislative Information. California Code Government Code 51084 Once the governing body adopts its resolution, that resolution creates a conclusive presumption that the required findings were satisfied.
Many municipalities fold open space easements into their general plans, zoning ordinances, and growth management programs, which can affect what the local body is willing to accept and on what terms.
How Long It Lasts
Open space easements can be granted in perpetuity or for a term of years, but any term easement must run at least 10 years. On each anniversary of acceptance, one year is automatically added to the remaining term unless either party has filed a notice of nonrenewal.5California Legislative Information. California Code Government Code 51081 A 10-year easement therefore never actually gets closer to expiring unless someone affirmatively stops it.
To stop renewal, the landowner or the holder has to serve written notice on the other party at least 90 days before the annual renewal date. Without that notice, the easement renews automatically. A landowner who receives a nonrenewal notice from the holder can file a written protest, and the holder can withdraw its nonrenewal notice any time before the renewal date.6California Legislative Information. California Government Code 51090-51094 – Termination of an Open-Space Easement
Conservation easements under Civil Code 815 are almost always perpetual. A term-of-years conservation easement would not qualify for the federal charitable contribution deduction, which is why permanent easements dominate in practice when tax benefits are part of the picture.
Property Tax Reduction
This is the benefit landowners feel first. The California Constitution, Article XIII, Section 8, directs the Legislature to ensure that enforceably restricted open space land is valued for property tax purposes consistent with its restrictions and uses, not based on what a developer would pay for it.7Justia. California Constitution Article XIII Section 8 – Taxation
Revenue and Taxation Code 421 and 422 define what counts as “enforceably restricted,” specifically including land subject to an open space easement, a Williamson Act contract, a wildlife habitat contract, or a scenic restriction.8California Legislative Information. California Code RTC 421-422 – Valuation of Open-Space Land Subject to an Enforceable Restriction Once the land qualifies, the county assessor cannot use comparable sales data. Instead the assessor values the land by capitalizing the income it actually earns or could reasonably earn under its restricted use, applying a capitalization rate built from an interest component, a risk component, and a property tax component.
On a 200-acre parcel near a growing suburb, the gap between “potential subdivision” value and “what a rancher would pay to lease it for grazing” is where the tax savings come from. On smaller parcels or land with little development pressure, the reduction may be modest.
Federal Tax Benefits
Federal income and estate tax benefits generally require the conservation-easement route under Civil Code 815, not the open space easement under the Government Code, because federal law demands perpetuity and specific conservation purposes.
To qualify for the federal income tax deduction under IRC 170(h), the easement must be a qualified real property interest (a perpetual restriction on use), granted to a qualified organization (a 501(c)(3) or government entity), made exclusively for conservation purposes, and protected in perpetuity.9Internal Revenue Service. Introduction to Conservation Easements – Statutory Requirements and Qualified Conservation Contribution Qualifying conservation purposes include outdoor recreation, protection of natural habitat, preservation of open space yielding significant public benefit (including scenic enjoyment or furtherance of a government conservation policy), and protection of historically important land.
The deduction equals the difference between the property’s fair market value before the easement and its value after, established by a qualified appraisal. A taxpayer can deduct up to 50 percent of adjusted gross income in the year of the contribution; a qualified farmer or rancher who derives more than 50 percent of gross income from farming or ranching can deduct up to 100 percent. Unused deduction carries forward up to 15 additional years at the same percentage limits.10Office of the Law Revision Counsel. 26 USC 170 – Charitable, Etc., Contributions and Gifts
On the estate side, IRC 2031(c) lets the executor elect to exclude from the gross estate up to 40 percent of the value of land under a qualifying easement, capped at $500,000.11Office of the Law Revision Counsel. 26 USC 2031 – Definition of Gross Estate The 40 percent rate applies when the easement’s value is at least 30 percent of the land’s unrestricted value; below that threshold, the percentage drops by two points for each percentage point under 30. The land must have been owned by the decedent or a family member for at least three years before death, and the election is irrevocable. For families holding significant agricultural or open space acreage, this can be the difference between keeping the land and having to sell it to pay the estate tax.
What the Deed and Supporting Documents Have to Contain
The written easement spells out what you can and cannot do with the land, the responsibilities of both parties, and the duration. It needs a legal description, usually supported by a survey or map, and under Government Code 51075 the deed must contain a covenant running with the land that prohibits construction except for improvements expressly reserved in the instrument, so long as those reserved uses are consistent with preserving the land’s natural or scenic character.3California Legislative Information. California Code GOV 51075 – Definitions
California requires notarization before the instrument is recorded with the county recorder in the county where the land sits. Government Code 27280 authorizes recording of any instrument affecting title to or possession of real property.12California Legislative Information. California Government Code – Documents to be Recorded Recording is what puts future buyers on notice. An unrecorded easement is an enforcement problem waiting to happen.
Baseline Documentation
If a federal tax deduction is part of the plan, Treasury Regulation 1.170A-14(g)(5)(i) requires you to give the receiving organization documentation establishing the condition of the property at the time of the gift. The baseline report typically includes survey maps, on-site photographs, identification of natural features and existing improvements, vegetation and wildlife data, and a signed statement from both donor and donee confirming its accuracy.13eCFR. 26 CFR 1.170A-14 – Qualified Conservation Contributions It becomes the reference for every future monitoring visit, and without it, proving a violation (or defending the deduction) gets much harder.
Mortgage Subordination
If there is a mortgage on the property, the lender has to subordinate its rights to the easement before the donation is made. Under Treasury Regulation 1.170A-14(g)(2), no deduction is allowed for a donated interest in mortgaged property unless the mortgagee subordinates to the donee’s right to enforce the conservation purpose. An easement that a foreclosing bank could wipe out is not “protected in perpetuity.” Fixing this after the fact does not work; courts have treated subordination as a prerequisite that must be in place at the time of contribution.
Qualified Appraisal
For a federal deduction above $5,000, you need a qualified appraisal and must file IRS Form 8283, Section B.14Internal Revenue Service. Instructions for Form 8283 The appraiser values the property both with and without the restriction, and the difference is the donated easement’s value. The effective date of the appraisal cannot be earlier than 60 days before the donation or later than the tax return due date. These appraisals typically run $5,000 to $40,000 depending on size and complexity.
Enforcement When Something Goes Wrong
Easement holders monitor compliance through periodic site visits, aerial imagery, and tracking of land use changes. The baseline documentation report is the yardstick for whether something has changed in a way the easement prohibits.
When unauthorized construction, clearing of protected vegetation, or other violations happen, Civil Code 815.7 gives the enforcement side real teeth. The grantor or the holder can seek injunctive relief from any court to stop ongoing or threatened violations. The holder can recover money damages, and courts can factor in the loss of scenic, aesthetic, or environmental value, going beyond simple restoration costs. The prevailing party can recover litigation costs and reasonable attorney’s fees.15California Legislative Information. California Code Civil Code 815.7 Local district attorneys or city attorneys may also intervene when the violation also breaches municipal land use rules.
Getting Out: Abandonment and Termination
Ending an open space easement is designed to be difficult, and the barriers reflect that intent.
Under Government Code 51093, a landowner can petition the local governing body to abandon the easement, but the body can approve only if it finds, by resolution, that no public purpose described in the original acceptance would be served by keeping the land as open space, that abandonment is consistent with the general plan and the purposes of the Act, and that abandonment is necessary to avoid substantial financial hardship caused by factors beyond the landowner’s control.6California Legislative Information. California Government Code 51090-51094 – Termination of an Open-Space Easement Hitting all those findings is a tall order.
Even if the governing body says yes, the landowner has to pay an abandonment fee before termination is effective. The assessor determines the land’s full cash value as if the easement did not exist, multiplies by 25 percent to get the “abandonment valuation,” and the fee is 50 percent of that, which comes out to 12.5 percent of the property’s unrestricted market value. No abandonment takes effect until the fee is paid, and a certified copy of the resolution must be recorded.16California Legislative Information. California Government Code 51094
Perpetual conservation easements under Civil Code 815 are harder still. Because the federal deduction requires permanent protection, unwinding one usually requires court involvement under the cy pres doctrine, which allows modification or termination only when subsequent circumstances have made the original purpose impossible or impractical. A court applying cy pres will try to redirect the land or sale proceeds to a use as close to the original conservation purpose as possible. If you took a federal deduction, termination can trigger recapture and additional tax consequences, and many easement deeds require compensation to the holder on extinguishment. Successful terminations are rare.
How This Differs From a Williamson Act Contract
Anyone looking at open space easements will run into the Williamson Act (California Land Conservation Act of 1965), and the two are easy to confuse. Under the Williamson Act, landowners contract with local governments to restrict their land to agricultural or open space use for a minimum 10-year term in exchange for lower property tax assessments, with the same rolling automatic renewal structure as a term open space easement.17Farmland Information Center. California Agricultural Districts Enabling Statutes – The Williamson Act
The practical difference: a Williamson Act contract is a state property tax tool tied to agricultural use. An open space easement or conservation easement can serve broader conservation purposes and, if structured as a perpetual conservation easement to a qualified holder, can unlock federal income and estate tax benefits that a Williamson Act contract by itself does not provide. Some landowners layer both on the same parcel, running a Williamson Act contract for state property tax treatment and granting a conservation easement for the federal deduction. The two programs share the valuation rules in Revenue and Taxation Code 421 through 423 but live in different chapters of the Government Code.