5.2 Legal Descriptions
Key Takeaways
- A legal description uniquely identifies a parcel so it can be conveyed and appraised; street addresses alone are not legal descriptions.
- Metes and bounds describes boundaries by courses and distances from a point of beginning and is common in original colonies and irregular parcels.
- Lot and block (recorded plat) identifies parcels by lot number within a named subdivision plat recorded in the public records.
- The government rectangular survey system uses meridians, base lines, townships, ranges, sections, and aliquot parts; a standard section is 640 acres.
- Exam math often tests section fractions: 1/4 section = 160 acres; 1/4 of 1/4 = 40 acres; know how to parse multi-part rectangular descriptions.
Purpose of a Legal Description
A legal description is the formal written identification of a parcel of real estate that is sufficient to locate and identify the property without relying solely on a street address. Deeds, mortgages, easements, and many appraisal reports reference the legal description from the deed or survey. Addresses change, buildings are renumbered, and rural properties may lack a useful street number—but the legal description ties the rights to a specific piece of the earth.
For appraisers, the legal description:
- Confirms what is being valued (and what is excluded)
- Supports size and boundary understanding when paired with a survey or plat
- Flags easements, exceptions, and outparcels that affect rights and utility
- Prevents valuation of the wrong tax parcel when addresses are shared or outdated
Exam rule: A mailing address is useful for inspection and marketing context; it is not a substitute for a legal description.
Three Primary Systems
| System | Core idea | Where commonly found | Strength | |---|---|---| | Metes and bounds | Boundary path by distance and direction from a point of beginning (POB) | Original 13 colonies and other eastern areas; irregular tracts nationwide | Flexible for odd shapes | | Lot and block | Lot number in a recorded subdivision plat | Urban/suburban subdivisions | Simple once plat is recorded | | Government rectangular survey | Grid of townships, ranges, and sections | Most states west of the original colonies; many rural areas | Systematic acreage math |
Many parcels use a hybrid: a rectangular survey description that ends with a metes and bounds exception, or a lot-and-block reference plus easement language. Read the entire description.
Metes and Bounds
Metes are distances and directions (courses); bounds are natural or artificial monuments (roads, streams, iron pins, adjoiners). A classic metes and bounds description:
- Starts at a point of beginning (POB) that can be relocated
- Calls a series of courses (for example, North 12°30' East 200.00 feet)
- Returns to the POB (the description must close)
- May reference monuments that control if distances conflict (monument priority is a survey principle; appraisers note conflicts and may need a surveyor)
When metes and bounds is used
- Irregular tracts that do not fit aliquot section parts cleanly
- Older eastern properties never platted into modern lots
- Remainder parcels after partial conveyances
- Easement centerlines and non-rectilinear rights-of-way
Appraiser focus
You are not expected to resurvey the earth on the exam, but you should recognize:
- Missing POB or failure to close → defective description risk
- Calls to "the old oak tree" without modern monumentation → potential boundary uncertainty
- Gross acreage in the deed may not match GIS if senior rights or occupation lines differ—scope may require a survey rather than guessing
Lot and Block (Recorded Plat System)
Under the lot and block system, a developer records a plat map showing numbered lots, blocks, streets, and often easements. Conveyance language looks like:
Lot 12, Block 3, Oak Grove Subdivision, according to the plat thereof recorded in Plat Book 14, Page 22, of the Public Records of Example County, State of X.
When lot and block is used
- Residential subdivisions
- Many industrial parks and commercial plats
- Any area where the public records contain a recorded map that subdivides a parent tract
Appraiser focus
- Pull or review the plat for lot dimensions, easements, notes, and dedicated rights-of-way
- Confirm the subject matches the lot you inspected (wrong lot number is a real error class)
- Note plat restrictions or notes that function like private land-use controls
- Lot size on the plat is a primary source for site size when a modern survey is not in the workfile (still understand uncertainty)
Exam tip: Lot and block is preferred for clarity after a plat exists; it does not create the land—recording the plat creates the reference system for those lots.
Government Rectangular Survey System
The Public Land Survey System (PLSS) / government rectangular survey divides land by reference to principal meridians (north–south) and base lines (east–west). From those axes:
- Townships are typically six miles by six miles (36 square miles)
- Each township contains 36 sections, each nominally one mile by one mile
- A full section contains 640 acres (nominal)
- Sections are numbered in a serpentine pattern from 1 to 36 within the township
Township and range labels
A township is identified by its position north or south of the base line and east or west of the principal meridian, for example:
Township 3 North, Range 2 West of the Sixth Principal Meridian
Aliquot parts (fractions of a section)
Sections divide into halves and quarters:
| Description (examples) | Nominal acres |
|---|---|
| Full section | 640 |
| 1/2 section (e.g., N1/2) | 320 |
| 1/4 section (e.g., SE1/4) | 160 |
| 1/2 of a 1/4 (e.g., N1/2 of SE1/4) | 80 |
| 1/4 of a 1/4 (e.g., NW1/4 of SE1/4) | 40 |
| 1/4 of 1/4 of 1/4 (e.g., SE1/4 of NW1/4 of SE1/4) | 10 |
How to parse multi-part descriptions (exam skill)
Read from the smallest part back to the section, or multiply fractions carefully.
Example 1: "The NW1/4 of Section 10"
→ 1/4 × 640 = 160 acres.
Example 2: "The S1/2 of the NE1/4 of Section 10"
→ 1/2 × 1/4 × 640 = 80 acres.
Example 3: "The SE1/4 of the SW1/4 of the NE1/4 of Section 10"
→ 1/4 × 1/4 × 1/4 × 640 = 10 acres.
Example 4 (addition): "The N1/2 of the NW1/4 and the SE1/4 of the NW1/4 of Section 10"
→ N1/2 of NW1/4 = 80 acres; SE1/4 of NW1/4 = 40 acres; if non-overlapping parts of the same quarter, total 120 acres. Sketch the quarter section to avoid double-counting.
Government lots and corrections
Due to earth curvature and survey history, some parcels along north and west township lines are government lots with irregular acreage—not perfect aliquot parts. Exam items may note that actual acres differ from nominal 640; use given survey acres when provided.
When rectangular survey is used
- Rural and agricultural land in PLSS states
- Large tracts, timber, ranch, and many development parent parcels
- Legal descriptions that never converted fully to lot-and-block
Coastal original-colony states historically rely more on metes and bounds; the exam still expects rectangular survey literacy because it is national content.
Which System Applies? Decision Map
| Situation | Likely system |
|---|---|
| Recorded residential subdivision lot | Lot and block |
| Farm described as "SW1/4 of Section 4, T2N, R3E" | Rectangular survey |
| Odd-shaped remainder after highway taking | Metes and bounds (often) |
| Condo unit | Usually unit/building references under condominium regime documents (related but distinct; not a vacant-land PLSS call) |
Legal Description Quality and Appraisal Scope
Appraisers should:
- Quote or attach the legal description used (deed, title commitment, or plat reference) consistent with assignment conditions and report type.
- Compare legal size to assessor and observed use—material conflicts need resolution or disclosure.
- Identify easements and exceptions called out in the description or title materials (access, utilities, conservation).
- Avoid inventing boundaries from aerials alone when the assignment needs certainty; recommend survey when required for credible results.
USPAP competence and scope-of-work concepts apply: if boundary location is critical to value and unknown, you cannot silently assume perfect boundaries.
Worked Exam-Style Calculation Set
Problem A: How many acres are in the E1/2 of the SE1/4 of Section 12?
Solution: 1/2 × 1/4 × 640 = 80 acres.
Problem B: A parcel is the NW1/4 of the NW1/4 of Section 12. Acres?
Solution: 1/4 × 1/4 × 640 = 40 acres.
Problem C: Township 4 North, Range 5 West contains how many full sections nominally?
Solution: A standard township has 36 sections.
Problem D: Why might "Lot 7, Block 2, Riverbend Estates" be preferred over a long metes and bounds call for the same house?
Solution: After plat recordation, lot and block is shorter, standardized, and maps easements/dimensions on a public plat—reducing ambiguity for typical subdivision lots.
Common Exam Traps
- Using 160 acres for a half section (half is 320; quarter is 160).
- Reading aliquot parts left-to-right without multiplying all fractions against 640.
- Saying a street address is a legal description.
- Confusing township (6-mile square unit) with a municipal "township" government name.
- Assuming every section contains exactly 640 usable acres when the stem gives a government lot with a different measured area.
Memory Hooks for Exam Day
- 640 acres per section; 36 sections per township; township 6 × 6 miles.
- Quarters: 160 → 40 → 10 as you keep taking quarters.
- Metes and bounds = walking the boundary; lot and block = plat book; rectangular = grid math.
Master these three systems and the acreage arithmetic. Legal description items in Area II are often quick points if you slow down, sketch the section, and multiply fractions in order.
How many acres are contained in the S1/2 of the NW1/4 of Section 18 under the standard government rectangular survey assumption?
A residential property is identified in the deed as “Lot 4, Block 2, Maple Ridge Subdivision, according to the plat recorded in Plat Book 9, Page 14.” Which legal description system is this, and when is it typically used?