What is a brief letter providing an estimate of value with limited property details referred to as?

A brief letter providing an estimate of value with limited property details is referred to as a Letter of Opinion. This type of document typically presents a straightforward assessment of a property's value based on the appraiser's experience and knowledge of the market, but it does not offer the comprehensive analysis or detailed information found in more formal reports.

A Letter of Opinion is useful for clients who need a quick valuation without the necessity of an extensive appraisal process. The clarity, conciseness, and accessibility of this format make it particularly beneficial in everyday real estate transactions, where clients may require an estimate in a more informal context, such as for preliminary discussions or decision-making processes.

In contrast, other types of reports like Narrative Reports or Reconciliation Reports involve more extensive data and analysis, which are not suitable for the context given by this question. Form Reports are usually standardized documents with specific data requirements, which again differ from the brief and informal nature of a Letter of Opinion.