Define the residence and the land as separate comparison questions
Valuing a San Martin home with land requires more than dividing a price by the parcel’s acreage. A buyer acquires a residence, site arrangement, infrastructure and rights supporting particular uses. Two parcels with similar total areas can offer different practical alternatives. The analysis should describe those differences and show which verified transactions support any monetary adjustment.
No permissioned closed-sale dataset or named broker valuation was supplied. The verified transaction sample in this draft is zero, and no current price conclusion is offered. Instead, two local public-record examples show how to prepare the evidence. Keep the San Martin guide, Santa Clara County overview and selling process guide alongside the subject file.
Gross and net plan areas are not a usable-acreage finding
The January 2022 archived Llagas Avenue sheets identify APN 825-07-048 with 4.00 acres gross and 3.77 acres net. Their descriptive difference is 0.23 acre, equivalent to 10,018.8 square feet using 43,560 square feet per acre. That arithmetic compares printed plan categories, not a present survey or a determination of usable ground.
Do not infer the reason for the difference from the calculation alone. The figures do not establish that the difference is a specific easement, roadway dedication or unbuildable area. Ask the appropriate reviewer to explain the definitions and supporting records for the actual property. A smaller net figure does not automatically supply a percentage discount to the land’s value.
For pricing, identify the land supporting the buyer’s actual use: the residence area, circulation, grounds, infrastructure and any specialist activity. Have the relevant reviewers establish the factual basis for that description. Total area, net area and usable area should remain distinct until the documents and qualified observations show what each term means for the candidate.
The associated County register lists PLN22-034 as a submitted proposal. Its archived plan is therefore context for the evidence question, not proof of a completed residence or present condition. The parcel is not presented here as a current private offering or a comparable sale.
Original gross/net description comparison
| Description | Plan amount or exact calculation | Limit |
|---|---|---|
| Gross area | 4.00 acres | January 2022 archived plan category. |
| Net area | 3.77 acres | Not assumed to mean all land is usable for the buyer’s purpose. |
| Difference | 4.00 − 3.77 = 0.23 acre | No deduction reason or private right inferred. |
| Area conversion | 0.23 × 43,560 = 10,018.8 square feet | Descriptive conversion only; no monetary adjustment. |
Source: archived site sheets, relevant sections read October 26, 2026. Exact decimal arithmetic checked. Actual title, current survey, approved plans, condition and permissioned sales were not supplied.
Keep proposed improvements out of verified existing area
The County register’s PLN24-077 entry at 2120 Church Avenue describes 1,167 square feet of existing living space and proposed additions of 630 and 1,195 square feet. Those stated components sum to 2,992 square feet. The register separately describes garage, utility and porch work and displays the application as Deemed Incomplete. It does not establish the proposed additions as completed living area.
That example illustrates a practical pricing boundary. A buyer considering an existing home should know whether a represented feature is existing, approved for future construction or merely proposed. Keep the source and stage beside the area figure. An application narrative should not become an as-built measurement simply because it contains detailed dimensions.
For the actual subject and each proposed sale, reconcile residential area, garages, barns and other structures separately. Ask which source defines the area and whether comparable entries use the same category. A price-per-square-foot calculation loses meaning when one denominator includes accessory structures and another describes only verified residential accommodation.
Obtain current plans and relevant completion records where they matter, then connect them with qualified present observations. Approval history and condition answer different questions. A documented addition can still need maintenance, while an incomplete online file does not diagnose a current defect. Keep both issues visible without using either as an unsupported valuation shortcut.
Describe specialist improvements by their actual function
A barn, stable, workshop or agricultural structure should be described through its documented purpose and current evidence. Ask what a buyer with the intended use would actually receive. A substantial structure can involve operating obligations or a specialized layout that appeals differently to different buyers. Its construction cost alone does not establish its resale contribution.
The County register separates applications for residences, accessory buildings and specialist uses. That distinction should carry into the pricing file. If the subject’s value premise depends on a future winery, additional accommodation or another activity, identify the current approval supporting that premise and the remaining conditions. Do not price an application-stage possibility as an established operating asset.
Ask the broker how the selected transactions support the proposed adjustment for a specialist improvement. A qualitative distinction may be more supportable than an exact dollar increment when evidence is limited. If a monetary amount is used, record its basis and uncertainty. Avoid a universal premium for every barn or a dollar-for-dollar return on the seller’s expenditure.
Keep personal preferences separate from market conclusions. A particular buyer may value working land or specialist space highly, but that does not establish that the wider comparison group paid the same increment. The broker’s analysis should explain which buyer alternatives and verified sales inform the judgment rather than presenting one household’s intended use as a market rule.
Compare infrastructure and access with equal evidence
The Llagas sheets identify separate water, wastewater and access components. For an actual subject, those systems should be described with evidence comparable to the information available for the selected sales. A utility-served residence and a home relying on private equipment may have different responsibilities. The community label should not silently make their arrangements equivalent.
County Environmental Health’s water-clearance guidance identifies the local system-review route. Obtain the actual candidate records and qualified assessment where material. A well label or a past test result does not establish every aspect of present supply, and a budget allowance does not substitute for a current system finding.
For access, distinguish legal rights, maintenance duties and physical condition. The County’s roads guide warns that right-of-way research is case-specific and map information is approximate. Obtain title and survey input as needed rather than treating a visible approach as proof of equivalent rights across the sample.
If an infrastructure difference affects buyer alternatives, ask the broker how the market evidence supports its treatment. A repair estimate, an annual operating amount and a sale adjustment are different things. A proposed correction may be necessary without establishing a matching price deduction. Preserve the professional scope and evidence behind the reasoning.
State the permission and selection rules for actual sales
The next stage requires authorized completed-transaction data. Identify the source, permission basis, sale period, geographic boundaries and property filters before drawing conclusions. For each entry, separate the evidence of closed price from the sources supporting land area, improvements, condition and rights. A recorded transfer alone may leave material context unresolved.
Keep current listings and pending transactions separate from completed sales. They can help describe competing alternatives while answering different questions. A seller’s asking price is not a verified amount paid by another buyer. Likewise, an advertised development idea is not evidence of a completed entitlement or a market-supported adjustment for that entitlement.
Document exclusions. A nearby sale may have a different ownership interest, an unverified structure or materially different land utility. Explain why it is unsuitable or what limits its use. If later evidence resolves the issue, preserve the reason and date for changing the sample so the analysis remains reviewable.
If the close local sample is small, state that limitation and explain each expansion. An older sale or another community can provide context while introducing time or location differences. A larger table does not automatically improve the analysis if its entries describe substantially different purchases. Keep the strongest comparisons identifiable rather than allowing weaker substitutes to dominate an average.
Make the final adjustment reasoning traceable
Use a consistent subject description and show which verified differences matter to the conclusion. For each material adjustment, state the supporting evidence and the professional judgment involved. If the available data support only a range or a qualitative ranking, preserve that limit. Exact-looking numbers should not imply more market evidence than the file contains.
Avoid counting one difference twice. A condition issue might affect both a repair estimate and the interpretation of a sale, while an access obligation may already be reflected in the selected comparison’s broader setting. Ask the broker to explain the relationship between adjustments so the final reasoning does not compound the same uncertainty under several labels.
Finish with the dated subject file, authorized sale sample and an explicit list of facts that could change the result. San Martin’s public records can clarify categories and identify unanswered questions. The final value judgment still depends on the actual home, its useful land and responsibilities, and the professional’s supported interpretation of verified transaction evidence.
