Real Estate Appraisal Expert Witness Services in California

Section 822 is where experienced appraisers most often come unstuck in condemnation work. It addresses matter that is inadmissible and may not be taken into account as a basis for a value opinion in eminent domain and inverse condemnation proceedings — including, among other things, the price and terms of an acquisition of property for a public use for which the property could have been taken by eminent domain.

The reasoning is straightforward once stated. A sale to a condemning authority is not an arm's-length market transaction, because one party could have compelled it. Treating such sales as comparables would let the condemnor's own acquisition programme set the market it is then required to pay.

In practice this means that on a corridor project — a transit alignment, a road widening, a utility easement — precisely the transactions that look most comparable, the neighbouring parcels acquired for the same project, may be the ones the opinion cannot rest on. An appraiser who builds a grid from those sales has produced work that has to be redone.

Whether any particular transaction falls within the section is a question for counsel. The expert's obligation is to identify the issue early, before the analysis is built, rather than to discover it in deposition.

Contested California valuations rarely turn on the arithmetic of a sales comparison grid. They turn on highest and best use — what the property could lawfully, physically, and economically have been used for at the valuation date.

That question absorbs the entitlement history, the zoning and general plan designation, the physical characteristics and access, and the realistic probability of a change in permitted use. It is where an appraisal opinion becomes genuinely expert work rather than data assembly, and it is where the two sides' numbers typically diverge by a multiple rather than a margin.

In partial acquisitions the analysis extends further, to what the remainder is worth after the taking and to whether the project has caused damage to it or conferred a benefit on it. Those components are analytically distinct and an opinion that blends them into a single number is difficult to defend line by line.

Not all California appraisal work is condemnation work. Diminution claims arise from construction defects, from contamination and environmental conditions, from landslide and geotechnical events, and from stigma following a publicised incident affecting a property.

These matters raise a recurring methodological question: whether the loss is properly measured as the cost of repair, as the difference in market value before and after, or as some combination, and whether a residual stigma survives a completed repair. Reasonable appraisers differ, which means the opinion has to state the method chosen and the reason for choosing it rather than presenting a figure as though it were the only available answer.

Where the underlying condition is itself contested, the appraisal opinion depends on a structural, geotechnical, or environmental opinion establishing what the condition is. Building a valuation on an assumed condition that the other expert does not ultimately support is a common and avoidable failure, and it is why these opinions are developed together.

Eminent domain and inverse condemnation matters are litigated in the Superior Courts, with Los Angeles, Orange County, San Diego, the Bay Area counties, and Sacramento accounting for most of the volume. Diminution claims follow the underlying dispute and are removed to federal court where diversity exists — where the general FRE 702 and Daubert framework applies rather than the state valuation article.

Appraisal work pairs most often with structural engineering and architecture where the diminution follows a construction defect, with insurance claims practice where a carrier has valued a loss, with business valuation where a going concern occupies the property, and with forensic accounting where rental income streams or business losses are in issue.

This page covers real estate appraisal expert witness work specifically in California. The real estate appraisal expert witness overview sets out the discipline across all three states, and the California expert witness page covers the admissibility standard, disclosure mechanism, and venues that apply to every discipline in California. The engagement process explains what happens after you make contact.