A curated set of professional organizations, standards, data platforms, and government tools we rely on for commercial real estate valuation.
The links below are provided as a starting point for clients, attorneys, lenders, and fellow appraisal professionals researching commercial real estate. They include the standards bodies that govern our work, the data platforms we use to build market evidence, and the public mapping and economic tools that support every assignment.
Industry membership organizations that set credentialing and ethics standards.
Largest U.S. organization for real estate appraisers; offers the MAI designation.
Sets national appraisal standards and qualifications, authorized by Congress.
American Society of Appraisers (ASA)
Multi-discipline appraisal society, including real property and commercial valuation.
International Right of Way Association (IRWA)
Professional association for right-of-way and infrastructure professionals worldwide.
Essential references for compliance, ethics, and best practices.
Uniform Standards of Professional Appraisal Practice (USPAP)
The recognized standards of conduct and performance for appraisers in the United States, published by The Appraisal Foundation.
Appraisal Institute — Standards & Resources
Standards of professional practice, code of ethics, and supplemental guidance for AI members.
Subscription-based platforms used for sales comparables, leases, and market analytics.
Comprehensive database for commercial properties, comparables, and market data.
Major commercial listings and marketplace platform (by CoStar Group).
Crowdsourced lease and sales comparables with analytics.
Commercial real estate listings, market data, and online marketplace.
CMBS data, distressed debt tracking, and valuation tools.
Strong dataset for multifamily, office, and industrial property performance.
County and metro-area property records, GIS, and parcel data.
Comprehensive database for properties in the Portland metro area.
GIS data for properties throughout the Portland metropolitan region.
Deschutes County Interactive Access Line (DIAL)
Comprehensive property database for Central Oregon (Deschutes County).
Oregon statewide mapping and regulatory tools.
Statewide Oregon plat maps and assessor data.
Oregon Water Rights Mapping Tool
Oregon Water Resources Department interactive map of water rights.
Federal economic, hazard, and topographic data sources.
FRED — Federal Reserve Economic Data
Economic data series from the Federal Reserve Bank of St. Louis; commercial real estate categories.
U.S. Bureau of Labor Statistics — CPI Data
Consumer Price Index data used for time adjustments and escalation analysis.
Official flood hazard maps and floodplain information from FEMA's Map Service Center.
Historical and current topographic data and quadrangle maps from the U.S. Geological Survey.
Quick lookup tool for elevation by street address.
Federal regulations and forms governing appraisals for tax-reporting purposes.
Real Property Valuation Guidelines
IRS Internal Revenue Manual, Part 4 — valuation guidelines for real property.
IRS Internal Revenue Manual — estate and gift tax examination procedures.
Publication 561 — Non-Cash Charitable Donations
IRS guidance on determining the value of donated property.
Form 8283 — Noncash Charitable Contributions
The IRS form filed by donors claiming a deduction for non-cash charitable contributions.
Disclaimer: L3 Valuation provides these links for informational and reference purposes only. We are not affiliated with the organizations listed (other than as members of certain professional associations), and we do not endorse, control, or guarantee the accuracy of any third-party content. External links open in a new window.
Contact our team leads in Portland or Bend for a quote, scope-of-work review, or independent appraisal review.
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