3.2 Land and Site Description and Legal Boundaries

Legal Descriptions of Real Property

A legally adequate land description is an indispensable foundation of every commercial real estate appraisal. A street address or informal tax parcel identifier is insufficient for legal conveyance because street names and parcel numbering systems change over time. A legal description must delineate a specific, unique tract of land on the surface of the earth such that a licensed professional surveyor can locate its boundaries precisely without reference to extrinsic evidence.

In the United States, three primary systems are used to describe real property boundaries:

1. Metes and Bounds
2. Public Land Survey System (PLSS / Government Survey System)
3. Lot and Block (Recorded Plat System)

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Metes and Bounds

Metes and Bounds is the oldest surveying system in the United States, originating in English common law and used predominantly in the original thirteen colonies, Maine, Vermont, Kentucky, Tennessee, West Virginia, Texas, and Hawaii.

• Metes refers to measures of length and distance (measured in feet, chains, or rods).
• Bounds refers to boundary lines, monuments, natural landmarks, and directional bearings.

A Metes and Bounds description always begins at a clearly established Point of Beginning (POB), which is tied to an authoritative permanent reference mark or monument (such as a county surveyor's brass disk set in bedrock or an iron pin set at a section corner). From the POB, the description follows a series of sequential calls.

Each call specifies two vital parameters:

1. A compass bearing indicating the angle of deviation from true North or true South.
2. A linear distance along that bearing line.

Bearings are expressed in degrees ($^\circ$), minutes ($'$), and seconds ($''$) of arc within four quadrants: Northeast (NE), Northwest (NW), Southeast (SE), or Southwest (SW). A bearing never exceeds $90^\circ$. For example, a call of $\text{N } 45^\circ\ 30'\ 15''\text{ E for } 250.00\text{ feet}$ directs the surveyor to face North, turn $45^\circ\ 30'\ 15''$ toward the East, and measure 250.00 linear feet along that line.

Public Land Survey System (PLSS / Government Survey)

Established by the Continental Congress under the Land Ordinance of 1785, the Public Land Survey System (PLSS) governs land descriptions across 30 public domain states in the Midwest, West, and parts of the South. The system creates a standardized grid based on celestial observations.

• Principal Meridians: True North-South reference lines of longitude running along a meridian.
• Base Lines: True East-West reference parallels of latitude intersecting the Principal Meridian at an established initial point.
• Township Tiers: East-West strips of land 6 miles wide running parallel to the Base Line, numbered North or South (e.g., Township 3 North, abbreviated T3N).
• Ranges: North-South strips of land 6 miles wide running parallel to the Principal Meridian, numbered East or West (e.g., Range 2 East, abbreviated R2E).
• Township: The intersection of a 6-mile township tier and a 6-mile range line forms a square tract of land measuring 6 miles by 6 miles = 36 square miles = 23,040 acres.

Section Subdivision and Numbering

Each 36-square-mile township is subdivided into 36 Sections. A standard section measures 1 mile by 1 mile = 1 square mile = 640 acres ($5{,}280\text{ ft} \times 5{,}280\text{ ft} = 27{,}878{,}400\text{ SF} \div 43{,}560\text{ SF/acre} = 640\text{ acres}$).

Sections within a township are numbered 1 through 36 in a serpentine or boustrophedon ("as the ox plows") pattern:

Under the original Land Ordinance of 1785, Section 16 in every township was reserved for the support of public education (frequently termed the "school section"). In western states admitted later, Section 36 was also set aside for schools.

Earth Curvature, Correction Lines, and Government Lots

Because lines of longitude converge toward the North Pole, true North-South range lines would gradually narrow as they travel northward. To adjust for this spherical distortion, the PLSS incorporates Guide Meridians (every 24 miles East and West of the Principal Meridian) and Standard Parallels / Correction Lines (every 24 miles North and South of the Base Line).

All convergence errors and measurement discrepancies are pushed into the north and west tiers of sections within each township (Sections 1, 2, 3, 4, 5, 6, 7, 18, 19, 30, and 31). Quarter-sections within these fractional sections that cannot be divided into standard 160-acre aliquot parts are designated as Government Lots, each assigned a specific lot number and surveyed acreage.

Calculating Aliquot Part Acreage

A section can be subdivided into aliquot parts (halves and quarters). To calculate the acreage of an aliquot legal description, multiply the fractional denominators backward starting from the 640-acre section:

$\text{Total Acres} = 640 \times \prod \text{fractions}$

• Example 1: Find the acreage of: "The $\text{N } 1/2 \text{ of the SE } 1/4 \text{ of the NW } 1/4 \text{ of Section 14}$." $\text{Acres} = 640 \times \frac{1}{2} \times \frac{1}{4} \times \frac{1}{4} = 640 \times \frac{1}{32} = 20\text{ acres}$
• Example 2: Compound descriptions containing the conjunction AND denote distinct parcels that must be calculated separately and summed: "The $\text{W } 1/2 \text{ of the NE } 1/4$ AND the $\text{SE } 1/4 \text{ of the NE } 1/4 \text{ of Section 22}$."
  • Parcel 1: $640 \times \frac{1}{2} \times \frac{1}{4} = 80\text{ acres}$
  • Parcel 2: $640 \times \frac{1}{4} \times \frac{1}{4} = 40\text{ acres}$
  • Total Acreage: $80 + 40 = 120\text{ acres}$

Lot and Block (Recorded Plat System)

The Lot and Block system is the universal legal description method for modern urban and suburban subdivisions. A developer surveys a master parcel, designs streets and individual lots, and submits a subdivision plat map to the local planning commission. Once approved, the plat is officially recorded in the county public land records (in a Plat Book).

A complete legal description cites the lot number, block number, subdivision name, recording book, page number, and county jurisdiction: "Lot 14, Block 3 of Highland Commercial Center, according to the plat thereof recorded in Plat Book 42, Page 18, Records of Maricopa County, State of Arizona."

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Physical Site Characteristics and Valuation Impacts

A certified general appraiser must evaluate the physical attributes of a site to determine its capacity to support commercial improvements, its construction costs, and its functional utility.

Frontage vs. Depth

• Frontage: The linear boundary of a parcel directly abutting a public thoroughfare, street, rail spur, or navigable waterway. In retail commercial and waterfront properties, frontage is a primary unit of comparison (e.g., price per front foot) because it provides visual exposure, customer drive-by visibility, and physical access.
• Depth: The horizontal dimension from the front property line to the rear boundary line.

In commercial appraisal, additional depth yields diminishing marginal utility. While the front portion of a commercial parcel accommodates high-value customer parking, showroom display, and ingress, excess rear depth often contributes minimal additional utility. Early appraisers formalized this economic reality through Depth Rules:

• The 4-3-2-1 Rule: Under this rule of thumb for standard commercial lots, the front 25% of the site's depth accounts for 40% of total site value; the second 25% accounts for 30%; the third 25% accounts for 20%; and the rear 25% accounts for only 10% of total value.
• The Hoffman and Harper Rules: The Hoffman rule holds that the front half of a standard-depth lot carries about two-thirds of its value; the Harper (square-root) rule holds that value varies with the square root of depth relative to a standard depth ($V \propto \sqrt{\text{depth}}$).

Shape and Corner Influence

• Parcel Shape: Rectangular or square parcels offer optimal building layout efficiency, standardized parking stall circulation, and lower construction costs. Highly irregular parcels (triangles, L-shaped tracts, or flag lots) suffer functional penalties due to awkward setbacks, inefficient parking layouts, and higher perimeter fencing and foundation costs.
• Corner Influence: Commercial sites located at street intersections frequently command a value premium over interior lots due to dual street visibility, higher vehicular traffic exposure, two distinct frontages for building signage, and multiple ingress/egress points. However, corner lots also face disadvantages: dual front setback requirements (which shrink the buildable envelope) and higher municipal special assessments for sidewalk and street paving.

Assemblage and Plottage

A central concept in commercial site analysis is the distinction between assemblage and plottage:

• Assemblage: The operational act, process, or financial transaction of combining two or more contiguous parcels into a single unified ownership.
• Plottage (Plottage Value): The incremental economic value created when the assembled parcel achieves a higher utility or accommodates a higher and better use than the sum of the separate individual parcels.

$\text{Plottage Increment} = V_{\text{assembled}} - \sum V_{\text{individual}}$

$\text{Assembler's Net Gain} = \text{Plottage Increment} - \text{Assemblage Costs}$

For example, if four small residential parcels worth $250,000 each are assembled for $1,000,000 with $50,000 in transaction costs, and the unified 2-acre site is rezoned to accommodate a regional retail pharmacy worth $1,600,000, the plottage increment is $1,600,000 - $1,000,000 = $600,000, and the assembler's gain after the $50,000 of assemblage costs is $550,000. Exam questions that say "plottage value" normally mean the increment, so read carefully when costs are also given.

If the combined parcel is worth only the sum of the individual parts, assemblage has occurred, but no plottage value was created.

Topography, Drainage, and Soil Bearing Capacity

• Topography: The physical contour, elevation, and slope of the land surface. Level to gently sloping sites are ideal for commercial construction. Severe slopes require extensive grading, cut-and-fill operations, and expensive concrete retaining walls, diminishing net land value.
• Drainage and Stormwater Management: Federal Clean Water Act Phase II mandates and local ordinances require commercial developments to retain and treat post-development stormwater runoff on-site. Retention and detention basins frequently consume 10% to 20% of a site's developable footprint, reducing net buildable area.
• Soil Bearing Capacity: The load-bearing strength of subsurface soils, measured in pounds per square foot (psf). Standard shallow spread footings require soil bearing capacities of 2,500 to 4,000 psf. Sites containing uncontrolled fill, high organic content, expansive clay soils (montmorillonite), or high water tables suffer low bearing capacity (under 1,500 psf), necessitating costly deep foundation systems (helical piles, drilled caissons, or deep soil grouting).

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Access, Ingress/Egress, and Traffic Considerations

Commercial site utility depends upon lawful and practical vehicular access. Appraisers must distinguish between legal access (the legal right of ingress and egress to a public right-of-way) and physical access (the engineering reality of driving a vehicle onto the site).

• Curb Cuts: An opening cut into a street curb to provide vehicular access. Curb cuts are governed by municipal public works departments or state Departments of Transportation (DOT). A site may have 500 feet of highway frontage but be restricted to a single right-in/right-out curb cut due to access management codes.
• Traffic Flow and Median Dividers: Raised concrete median barriers in arterial roadways prevent left turns into commercial sites. A fast-food restaurant or convenience gas station located on the "wrong side" of an undivided highway that undergoes median installation can suffer a 30% to 50% decline in customer traffic.
• Average Annual Daily Traffic (AADT): The total volume of vehicular traffic in both directions passing a specific point on a roadway over 24 hours, averaged across 365 days. Appraisers also evaluate commuter directionality: the P.M. commute (going-home side) commands a premium for convenience stores, dry cleaners, and grocery stores, while the A.M. commute (going-to-work side) favors breakfast and coffee drive-through concepts.

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Utilities and Infrastructure Capacity

The availability and capacity of public infrastructure fundamentally dictates a site's highest and best use:

• Municipal Water: Appraisers must verify pipe diameter (e.g., 6-inch vs. 12-inch water main), static and residual pressure in pounds per square inch (PSI), and fire hydrant flow rates in gallons per minute (GPM). Fire codes commonly require commercial sites to have hydrant fire flow of 1,500 GPM or more at 20 PSI residual pressure (with reductions for sprinklered buildings), and the sprinkler system itself needs adequate supply pressure.
• Sanitary Sewer: Gravity sewer lines are vastly superior to pressurized force mains or lift stations. If municipal sewer is unavailable, the site must rely on private on-site septic absorption fields, which require extensive land area and satisfactory soil percolation ("perc") rates, severely restricting development density.
• Electric, Gas, and Fiber: Commercial and industrial operations require three-phase electrical power (208V, 480V, or higher), high-pressure natural gas lines, and high-speed broadband fiber-optic telecommunications.

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Easements, Encroachments, and FEMA Flood Zones

Easements

An easement is a non-possessory real property interest granting its holder the right to use another person's land for a specific, limited purpose.

• Appurtenant Easement: Involves two separate parcels under different ownership. The Dominant Tenement is the parcel that benefits from the easement; the Servient Tenement is the parcel burdened by the easement. Appurtenant easements "run with the land" and transfer automatically with the title upon conveyance of either parcel.
• Easement in Gross: Benefits a specific individual or corporate entity rather than a parcel of land (there is no dominant tenement). Commercial easements in gross—such as regional electrical transmission lines, interstate petroleum pipelines, municipal sewer rights-of-way, and railroad trackage agreements—are assignable, transferable, and run with the burdened servient estate.
• Easement by Prescription: An easement acquired through continuous, open, notorious, and hostile use of another's land for a statutory period (commonly 5 to 21 years, depending on state law).

Encroachments

An encroachment is the unauthorized physical intrusion of an improvement, structure, roof overhang, driveway, or fence across a legal property boundary line onto adjoining land. Encroachments are physical encumbrances revealed through an ALTA/NSPS Land Title Survey. If allowed to persist through the statutory period, an encroachment can ripen into a prescriptive easement or adverse possession claim, creating a title defect.

FEMA Flood Hazard Zones

The Federal Emergency Management Agency (FEMA) maps flood risk across the nation on Flood Insurance Rate Maps (FIRMs). Appraisers must review FIRM panels to classify properties into flood hazard categories: