7.2 Physical Site Evaluation, Ingress/Egress & Accessibility

7.2 Physical Site Evaluation, Ingress/Egress & Accessibility

[!NOTE] CCIM Physical Due Diligence Foundation: Commercial real estate underwriting bridges macro trade area demographics and parcel-level physical execution. A trade area may exhibit stellar purchasing power and attractive lifestyle profiles, but if a parcel suffers from restricted vehicular ingress, hazardous approach speeds, poor lot geometry, or an unresolvable parking deficit, the proposed commercial enterprise will fail. CCIM practitioners rigorously evaluate physical site characteristics, separate visibility from accessibility, evaluate traffic engineering dynamics, design access configurations, and enforce parking requirements and Americans with Disabilities Act (ADA) compliance.

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Physical Site Characteristics and Land Configuration

Parcel evaluation begins with physical and civil engineering attributes that dictate development yield, site civil budgets, and operational layout:

1. Parcel Geometry & Frontage-to-Depth Ratios

Regular rectangular parcels maximize layout efficiency, building footprint sizing, parking field circulation, and truck loading zones. Irregular parcels (e.g., acute triangles, trapezoids, or narrow flag lots) create stranded dead space and elevate site improvement costs per usable square foot. Optimal commercial frontage-to-depth ratios range between 1:2 and 1:3 (for example, 200 feet of arterial frontage by 400 to 600 feet of depth):

• Excessive Depth: Creates stranded rear acreage that cannot achieve commercial visibility or direct road access, requiring internal spine roads or lower-value secondary uses.
• Excessive Frontage with Shallow Depth: Restricts parking field depth, prevents dual-loaded parking bays, and eliminates required truck turning radiuses behind retail pads.

2. Topography, Grading & Stormwater Engineering

Gentle slopes between 1.0% and 3.0% enable natural sheet drainage and gravity-fed utility flow with minimal earthwork. Steep slopes (>5.0%) require extensive cut-and-fill grading, soil import/export, and engineered retaining walls ($40 to $80+ per square foot of vertical face). Furthermore, municipal stormwater retention and water quality regulations (NPDES standards) require surface detention basins that consume 10% to 20% of net usable site area, unless developers fund costly underground precast concrete stormwater retention vaults ($3.00 to $5.00 per gallon of stored runoff).

3. Geotechnical & Subsurface Soil Mechanics

Geotechnical engineers extract soil borings to establish bearing capacity, expressed in pounds per square foot (psf). Standard commercial shallow spread footings require soil bearing capacities of 2,500 to 4,000 psf. Sites encumbered by unconsolidated fill, expansive shrink-swell clays, high water tables, or organic peat require expensive over-excavation and soil replacement, lime/cement stabilization, or deep foundation systems (helical piers, driven steel piles, or drilled concrete caissons) that inflate pre-development budgets.

4. Utility Infrastructure & Tap Fees

Underwriters must audit the physical capacity, pressure, and connection locations of municipal utilities:

• Water Supply: Commercial and retail centers require minimum 8- to 12-inch water mains capable of sustaining fire flows of 1,500 to 2,500+ gallons per minute (GPM) at 20 psi residual pressure for automatic fire sprinkler systems.
• Sanitary Sewer: Gravity flow sewer access is vital. If a site sits below the municipal sewer main elevation, developers must install private on-site lift stations and force mains, creating ongoing mechanical maintenance obligations.
• Electrical & Gas: High-draw tenants (supermarkets, restaurants, cold storage) require 480V, 3-phase electrical service and high-pressure natural gas lines. Municipal utility tap fees and regional impact fees can add hundreds of thousands of dollars to site costs.

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Accessibility vs. Visibility: The Critical Commercial Distinction

A foundational rule of CCIM site analysis is that Visibility does not equal Accessibility:

• Visibility: The visual exposure of a parcel, building facade, architectural canopy, and exterior signage to passing vehicular and pedestrian traffic. Governed by clear sightlines, view corridors, approach speeds, roadway curvature, and structural or botanical obstructions (adjacent buildings, overpasses, billboards, mature trees).
• Accessibility: The physical ease, safety, and convenience with which vehicular and pedestrian traffic enters, circulates through, and exits the property. Governed by curb cuts, median breaks, turn bays, deceleration lanes, traffic signals, curb radiuses, and on-site drive aisles.

Commercial property sectors exhibit radically divergent priorities between visibility and accessibility:

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Traffic Engineering: Volume, Speed & Directional Commute Flow

Underwriters analyze municipal and state Department of Transportation (DOT) traffic engineering datasets to quantify customer exposure and turning friction:

1. Average Daily Traffic (ADT) vs. Peak-Hour Flow

State DOTs publish 24-hour Average Daily Traffic (ADT) and Annual Average Daily Traffic (AADT) counts. While strong ADT (20,000 to 45,000 vehicles per day) provides exposure, raw volume alone does not ensure retail sales. Analysts examine peak-hour volume factors ($K$-factor: peak-hour volume as a percentage of ADT, typically 8% to 12%) and directional splits ($D$-factor: directional distribution during peak hours, e.g., 60/40 inbound vs. outbound).

2. Posted Travel Speed and Turning Friction

High vehicular speeds along arterial roadways create severe turning friction. At posted speeds of 45 to 55+ mph, motorists experience perceptual tunnel vision, and the physical braking distance required to decelerate safely into an unsignalized curb cut exceeds 250 to 350 feet. Motorists who spot a retail sign at 50 mph cannot execute a safe turn without risking rear-end collisions from following traffic, causing impulse customers to bypass the property entirely.

3. Directional Commute Flow: The A.M. vs. P.M. Side of the Road

On divided commercial arterials, traffic splits into directional commute streams governed by daily driver routines:

• A.M. Commute Side (Inbound to Employment Cores): Captures morning traffic moving toward employment nodes. Essential for drive-thru coffee shops, breakfast quick-service restaurants, morning bakeries, and commuter convenience/fuel stations. Motorists operate under rigid morning time constraints and will not make difficult left turns across multi-lane traffic.
• P.M. Commute Side (Outbound to Residential Neighborhoods): Captures evening traffic returning home from work. Dominates sales for supermarkets, liquor stores, pharmacies, dry cleaners, fitness gyms, child pickup services, and sit-down dining. Consumers run errands on the journey home so groceries and refrigerated products do not spoil in parked vehicles during the workday.

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Ingress, Egress, Curb Cut Geometry & Intersection Dynamics

Access configurations govern customer safety, queuing capacity, and transaction velocity:

Access Classifications

1. Full-Movement Access: Permits all four vehicular maneuvers (right-in, right-out, left-in, left-out). Provides maximum commercial utility and customer capture.
2. Right-In / Right-Out (RIRO): Restricts access exclusively to right-hand turns, eliminating conflicts with opposing traffic. Commonly mandated by DOTs along median-divided arterials. RIRO cuts off 50% of passing traffic arriving from the opposing direction unless convenient U-turns exist.
3. Three-Quarter Access: Permits right-in, right-out, and left-in maneuvers via a dedicated median break, but strictly prohibits hazardous left-out turns across multi-lane traffic.

Deceleration Lanes and Turn Bays

On high-speed arterials ($\ge 45$ mph), DOT access permits require dedicated deceleration lanes consisting of a transition taper (typically 100 to 150 feet) and a full-width deceleration storage bay (150 to 250 feet). Deceleration lanes allow turning vehicles to exit active travel lanes before braking, preventing rear-end collisions. Opposing traffic requires a dedicated left-turn storage bay cut into the central median to prevent stopped vehicles from blocking arterial through-lanes.

Signalized Intersections

Properties located at signalized hard corners command substantial rent premiums (15% to 35%+ over mid-block parcels) because traffic signals provide protected left-turn phases, predictable vehicular clearing, cross-street accessibility, and safe pedestrian crosswalks. Signal warrant studies (MUTCD Warrants 1 through 9) determine whether a developing intersection meets traffic volume thresholds to legally require municipal signal installation.

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Parking Requirements and Land Allocation Across CRE Sectors

Parking capacity is measured by the Parking Ratio, expressed as dedicated parking spaces per 1,000 Rentable Square Feet (RSF) of Gross Building Area (GBA):

$\text{Parking Ratio} = \frac{\text{Total Dedicated Parking Spaces}}{\text{Total RSF} / 1,000}$

Physical Land Allocation per Surface Parking Stall

A standard 90-degree commercial parking stall measures 9 feet wide by 18 to 19 feet deep (162 to 171 square feet). However, when adding the shared 24-foot two-way drive aisle, end-of-row turning caps, landscape islands, pedestrian walkways, and perimeter stormwater berms, developers must budget:

$\text{Land Area per Surface Stall} = \mathbf{350 \text{ to } 400 \text{ Square Feet of Site Area}}$

Consequently, an asset requiring 100 surface parking spaces consumes 35,000 to 40,000 square feet (0.80 to 0.92 acres) of land solely for vehicular parking and circulation.

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Americans with Disabilities Act (ADA) Title III Compliance

The Americans with Disabilities Act (ADA) Title III establishes federal civil rights mandates governing commercial facilities and places of public accommodation. Non-compliance exposes property owners to private lawsuits, statutory fines, and injunctive retrofits.

1. Minimum Accessible Parking Stall Allocation

ADA regulations dictate the minimum number of accessible stalls required based on total parking lot capacity:

2. Van-Accessible Stall Specifications

At least 1 in every 6 accessible spaces (or fraction thereof) must be designated as van-accessible. Van stalls require an 8-foot (96-inch) parking space accompanied by an adjacent 8-foot (96-inch) passenger loading access aisle (or an 11-foot van stall with a 5-foot aisle). They must provide minimum unobstructed vertical clearance of 98 inches (8 ft 2 in) along vehicular access routes and parking berths.

3. Maximum Surface Grading and Slope Tolerances

Accessible parking stalls and their associated access aisles must be virtually flat: the maximum allowable slope in any direction is 1:50 (2.0%). Repaving or slurry-sealing an existing parking lot without maintaining this 2.0% maximum tolerance is a common violation leading to immediate federal litigation.

4. Continuous Accessible Path of Travel

Properties must provide an unobstructed, continuous route connecting accessible parking stalls, public passenger drop-off zones, and municipal sidewalks directly to the main accessible building entrance. Ramps along this path cannot exceed a maximum slope of 1:12 (8.33%) with level rest landings every 30 inches of vertical rise.

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Comprehensive Worked Case Study: QSR Drive-Thru vs. Outpatient Pediatric Clinic

A commercial development entity holds a purchase option on two adjacent 1.50-acre parcels ($65,340 \text{ sq ft}$ each) situated along a 4-lane divided state arterial carrying 42,000 ADT at a posted speed of 45 mph:

• Parcel A (Corner Site - Inbound A.M. Commute Side): Located on the hard corner of a signalized intersection with full cross-street access. Parcel dimensions: 170 ft frontage $\times$ 384 ft depth. Fully signalized with dedicated turn phases from both streets.
• Parcel B (Mid-Block Site - Outbound P.M. Commute Side): Located 800 feet east of the intersection. Parcel dimensions: 285 ft frontage $\times$ 229 ft depth. Access is restricted by a continuous raised concrete median to Right-In / Right-Out (RIRO) only.

Two creditworthy national tenants are competing for space:

1. Tenant 1 (BeanBrew Coffee / Breakfast QSR): 2,800 RSF building requiring a dual-lane drive-thru stacking 12 vehicles, 30 customer/staff parking stalls (10.7 ratio), and heavy morning commute customer capture.
2. Tenant 2 (CareFirst Outpatient Pediatric Clinic): 12,500 RSF medical building requiring a minimum 5.5 parking ratio (69 dedicated stalls), a continuous patient drop-off canopy, and multi-specialty clinical exam rooms.

Step 1: Geometric Footprint and Parking Allocation

• Tenant 1 (BeanBrew QSR): 2,800 RSF building footprint + 30 parking stalls $\times$ 375 sq ft = 11,250 sq ft of parking + dual-lane drive-thru bypass lanes (14,000 sq ft) = 28,050 sq ft of site improvements. Fits easily on either 65,340 sq ft parcel.
• Tenant 2 (CareFirst Clinic): 12,500 RSF single-story clinic footprint. Required parking at 5.5 stalls/1,000 RSF: $12.5 \times 5.5 = \mathbf{68.75 \implies 69 \text{ stalls}}$. Parking land area required: $69 \times 375 = \mathbf{25,875 \text{ sq ft}}$. Footprint + parking = $12,500 + 25,875 = 38,375 \text{ sq ft}$. Factoring 25-foot perimeter setbacks, stormwater retention (8,000 sq ft), and patient drop-off canopy (3,000 sq ft), total required site area is $\approx 58,000 \text{ sq ft}$, fitting comfortably on a 1.50-acre parcel.

Step 2: Traffic Flow, Commute Direction & Accessibility Analysis

• Tenant 1 (BeanBrew QSR): Generates 75% of daily revenue between 6:30 AM and 9:30 AM. Morning commuters travel on the inbound (A.M.) side of the arterial. Parcel A is situated directly on the inbound side with full signalized corner ingress and egress. Commuters turn right-in from the arterial and exit via the side street signal. Conversely, Parcel B sits on the outbound (P.M.) side behind a continuous raised concrete median. Inbound morning commuters cannot access Parcel B without driving past the site, executing a hazardous U-turn at the next signal, and backtracking 1,600 feet. BeanBrew would fail on Parcel B.
• Tenant 2 (CareFirst Clinic): Pediatric medical appointments are scheduled destination visits distributed evenly between 8:30 AM and 5:00 PM. Patients do not make spontaneous impulse turns. Parents driving to pre-scheduled appointments are willing to navigate a right-in entrance or downstream median U-turn. Furthermore, Parcel B's wider frontage (285 ft) provides an expansive front patient parking field and wide ambulance/drop-off circulation.

Step 3: ADA Title III Allocation for Tenant 2

CareFirst requires 69 parking spaces. Applying the ADA schedule:

• For a 69-stall lot (51 to 75 tier): 3 accessible stalls required.
• Van-accessible rule (1 in 6): 1 of the 3 stalls must be van-accessible (96" stall + 96" access aisle, 98" vertical clearance).
• Maximum slope across stalls and access aisles: strictly capped at 1:50 (2.0%).

Underwriting Assignment

• Parcel A is assigned to BeanBrew QSR: Signalized full-movement access and inbound morning commute alignment maximize breakfast drive-thru transaction velocity.
• Parcel B is assigned to CareFirst Clinic: Destination healthcare dynamics overcome mid-block RIRO restrictions, while the wide site geometry accommodates the 12,500 RSF medical footprint and 69 required parking stalls.

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CCIM Exam Traps & Common Site Due Diligence Errors

1. The High-ADT Mirage: Equating heavy traffic volume with retail viability. A parcel along a 55,000 ADT state highway posted at 55 mph with a continuous concrete median is virtually inaccessible. Motorists cannot stop safely, rendering high exposure useless for convenience retail.
2. Commute Flow Directional Mismatch: Locating an impulse morning breakfast or coffee concept on the outbound (evening) commute side of a divided highway, ignoring the severe turning friction that deters morning commuters.
3. The Medical Conversion Parking Trap: Underwriting the conversion of suburban general office space (parked at 3.0 to 3.5 stalls/1,000 RSF) to outpatient medical suites without securing parking variances or adjacent land. Medical clinics mandate 4.5 to 5.5+ stalls/1,000 RSF; failing to verify this creates building code violations and lease defaults.
4. ADA Pavement Resurfacing Violations: Resurfacing or applying asphalt slurry coats to commercial parking lots without re-engineering slopes. Exceeding the 2.0% maximum slope tolerance in accessible stalls or access aisles creates immediate liability under federal ADA Title III enforcement.