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510 Spring St, Herndon, VA 20170
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Property summary
AI-generated overview
An office building located in Herndon, Virginia, within about 1 mile of the Fairfax County Parkway and the Dulles Toll Road. The building contains approximately 26,390 square feet of office space and is described as having Class B amenities. It offers ample parking with a ratio of about 4.4 spaces per 1,000 square feet and provides potential for building signage. The property includes an on-site backup generator and supports 24/7 access through key card security. Locker rooms and showers are available for both men and women. The site is adjacent to the W&OD hike and bike trail and is located within about 1 mile of the Silver Line Metro.
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING
Year built
1999
Construction
STEEL FRAME
Total area
61,981 SF
Lot
4.5 ac (196,100 SF)
Zoning code
O&L I(OFFICE &LIGHT INDUS
APN
016-2-02-0156-J
UPID
US87-3656991
Cap rate & NOI
Priority signal for investors
Implied cap rate, NOI & suggested price
Cap rate vs submarket · NOI estimate · 3 price anchors
Current use
Occupant on record · Public records
-
University
-
Financial Advisor
-
Telecommunications Service
-
Hardware & Home Improvement
-
Loan Service
Location
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
$6.27M
CAP Approach
CAP
by Request
Comparable Approach
Comparable
$8.85M
Blend (final)
Blend
$6.19M
Owner & transaction history
since 2020
Last sale
$6.5M
3 recorded transactions
Zoning & alternative use
O&L I(OFFICE &LIGHT INDUS · Herndon, VA
Comparables
6 recent transactions · within 1.5 miComparable in this city
6 recent transactions
Comparable in this City
Similar Nearby for Sale
Similar Nearby for Lease
Recent comparable sales
Sale price & price/SF · Sale date & distance · Adjustments & confidence
Value estimation
Instant AI valuation built from comps, income signals, and proprietary benchmarks. A defensible range, not a single guess.
17% off on annual
Unlock the complete Valuation workflow
Full NOI reconstruction, selected comps, alternative-use scenarios, data audit and PDF export.
Full NOI build-up · 6 steps
All 4 comparables with addresses
Sensitivity value band
Source audit · 6 inputs
PDF export
Analytics Standard · 5 reports
from $99/month
from $99/month
Summary
1
Valuation conclusion
Included free
Estimated market value
$6.19M
Value range
$5.57M – $6.80M
±10% around blend
Estimated value / SF
$100 / SF
Confidence
Low
4 county-verified comps
Property data
100
Market benchmarks
100
Comparable evidence
40
Income certainty
100
$5.57M
blend $6.19M
$6.80M
Market-derived valuation under stabilized market assumptions. Desktop analysis. No physical inspection performed.
2
Subject property
Included free
GBA
61,981 SF
Lot area
4.5 ac
Year built
1999
Stories
2
APN
016-2-02-0156-J
Zoning
O&L I(OFFICE &LIGHT INDUS
Assessed value
$4,708,550
Annual tax
$80,210
3
Income approach: direct capitalization
Partial preview
Estimated Stabilized NOI, derived from market rent, vacancy and expense benchmarks. Actual property income not reported.
Estimated market rent / SF
Potential gross income
Vacancy allowance
Effective gross income
Benchmark operating expenses
Stabilized NOI
Property tax
$80,210
Selected cap rate
4
Sales comparison
Partial preview
Sales approach indication
$15.32M
Weighted, 4 comps · low confidence
Evidence
4 found · 4 selected
County-verified recorded sales
Comparable
Sale dateSale price$ / SF
9.6 mi away · 80,256 SF
18.3 mi away · 68,405 SF
19.3 mi away · 64,580 SF
5
Sensitivity & risk
Partial preview
Downside
−10%
Base
$6.19M
Upside
+10%
Bounds of the ±10% band vs the blend — never simulated scenarios.
6
Current market position
Included free
Benchmark
Observed band ($/SF)AverageSubject delta
ZIP 66 sales
$280
-64%
Submarket 170 sales
$290
-66%
County 837 sales
$289
-65%
Band = middle half (Q1–Q3) of recorded sale $/SF for this use type per geography; the diamond marks the subject at $100/SF. Delta below average reads as headroom. Source: Realmo CRE sales derivatives (county records).
7
Data & methodology
Included free
Building area
County record
Property tax
County record
Assessed value
County record
Zoning designation
County record
Operating expenses
Modeled
Market rent
Market benchmark
Not analyzed due to unavailable source data: actual rent roll, tenant leases, physical condition and capital
requirements are outside a desktop analysis.
Cost Approach excluded: income and sales evidence cover the value conclusion.
Automated valuation analysis, not a licensed appraisal. Figures are derived from public
records and proprietary models. Desktop analysis: no physical inspection, tenant leases or reported
property income. Verify with a licensed appraiser before transacting.
Cap rate
Cap rate calculated from real income and expense signals, benchmarked against sales of similar assets nearby.
17% off on annual
Unlock the complete Cap Rate workflow
Full market tables, editable assumptions, comparable evidence, saved work and exports.
9-scenario matrix
Comparable evidence · 4 sales
NOI build-up · 9 steps
Market rates by use type
PDF export
Analytics Standard · 5 reports
from $99/month
from $99/month
Overview
No cap rate is computable for this property yet: no recorded sale, income signal or market-rate row for its use type.
Price sensitivity
The rate is the decision lever; valuation is the consequence.
Test a cap rate
Implied value$16.76M
Move the market yield to see immediate price impact.
Value / SF
$270
Vs. selected
Base
Derivation
NOI ÷ cap
Arithmetic over the derived NOI * — not market scenario modeling.
NOI × cap matrix
Preview
Preview of 9 modeled outcomes.
NOI
5.00%7.00%9.00%
$1.06M
$21.12M
$15.09M
$11.73M
$1.17M
$23.47M
$16.76M
$13.04M
$1.29M
$25.81M
$18.44M
$14.34M
NOI sensitivity ±10% across the 5 / 7 / 9% anchors — derivation of the NOI above.
Comparable evidence
Partial preview
Recorded sales nearby
4 found
Low confidence · county-verified
Closest comparable
$21.50M
3.1 mi · Jan 2026 · $267/SF
Property tax & assessments
Tax year 2024Property tax & assessments
Tax year 2024
Tax billed
$80,210
Tax year 2024
Assessed value
$4,708,550
Assessed 2024
Previous assessed
$5,225,910
-9.9% YoY
Effective rate
1.70%
On assessed value
Assessed land
$1,239,620
Assessed improvement
$3,468,930
Land market value
$1,239,620
Improvement market value
$3,468,930
Total market value
$4,708,550
Automated cap rate analysis. Based on public records, market benchmarks and proprietary
models. Verify with a licensed professional before transacting.
Property description
Physical attributes from public recordsBuilding & lot
Public records
Property type
Office buildings
Use group
OFFICE BUILDING
Status
For Lease
Year built
1999
Construction
STEEL FRAME
Heating
OTHER
Cooling
YES
Stories
2
Total area
61,981 SF
Lot
4.5 ac (196,100 SF)
Zoning code
O&L I(OFFICE &LIGHT INDUS
APN
016-2-02-0156-J
UPID
US87-3656991
Jurisdiction
FAIRFAX
Metro division
WASHINGTON-ARLINGTON-ALEXANDRIA, DC-VA-MD-WV METROPOLITAN DIVISION
Zoning & alternative use
O&L I(OFFICE &LIGHT INDUS · Herndon, VAZoning O&L I(OFFICE &LIGHT INDUS · permitted uses
O&L I(OFFICE &LIGHT INDUS · Herndon, VA
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Building & site characteristics
From public records
Year built
1999
Construction
STEEL FRAME
Heating
OTHER
Cooling
Yes
Stories
2
Lot
4.5 ac
Zoning
The recorded zoning designation, what the district officially allows, and the municipal source it comes from.
Zoning designation
County-recorded code
O&L I(OFFICE &LIGHT INDUS
Jurisdiction
Herndon, VA
Recorded code
O&L I(OFFICE &LIGHT INDUS
Ownership Intelligence
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Ownership report
Owner identityResolved entity and name variants
Portfolio holdingsLinked properties and estimated value
Deal signalsSell-side activity worth following
Debt & historyRecorded loans and transaction history
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Owner of record and activity signals are derived from public records and modeled classifications.
They do not confirm beneficial ownership or intent to transact.
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