Property Data Update Frequency Guide Core point Set refresh frequency by how quickly
Property Data Update Frequency Guide Core point Set refresh frequency by how quickly a field can change: availability, price and restrictions need checks closer to a decision than construction year or registered area. How to verify it Store source date and last verification for each material field instead of one date for the entire page.
Decision impact When sources conflict, do not silently overwrite a value; record the discrepancy and the preferred source or need for revalidation. Property-data refresh frequency Continuous data maintenance reduces misleading listings and improves decision quality.
The supplied workflow calls for weekly refreshes of price and availability, monthly refreshes of financial and regulatory data, periodic direct confirmation with sellers or site management, API integration where available for automatic status changes, and immediate deletion or archiving of properties that have been sold. Evidence to retain Maintain the website System Log, time-limited exclusive brokerage agreements, and a field-review list showing availability and current asking prices.
Decision use Leaving sold inventory marked as available damages credibility and may create misleading-advertising exposure. Because rental inventory moves faster, the source recommends refreshing rental availability every 48–72 hours.
Valuation validity and property identity
Keep inspection date, report date, methodology and comparables, legal versus actual area, restrictions and assumptions distinct, and never let one valuation figure replace title, zoning or building-status checks. A valuation report should not be used outside its purpose, date and property identity. Match the taşınmaz number, ada/parsel, independent-unit number and description to the transaction, and confirm the valuer is authorised within the SPK framework when such authorisation is required. For each fact use a source capable of proving it and link the result to its effect on purchase, ownership or cost.
The review becomes useful when the finding is tied to a defined effect on rights, price, cost or executability and backed by evidence that can be rechecked later. TKGM states that valuation reports issued before 9 December 2024 had a three-month validity window, while a Tutar Tespit Belgesi issued after that date has a six-month validity period; material changes to the property or application can also require a fresh valuation. TCMB housing price indices provide market-movement context, not the value of one unit. Turn the review topic into provable facts: identity, date, amount, registry status, document or technical condition.
From market data to testable cash flow
Calculate gross yield from annual rent relative to price, then calculate net yield after vacancy, management, maintenance, insurance, taxes, dues and non-recoverable costs. For each fact use a source capable of proving it and link the result to its effect on purchase, ownership or cost. For a capitalization rate, use NOI before debt service and distinguish property performance from leveraged equity return. Any rent-growth, resale-price or interest-rate assumption should be stress-tested with alternative scenarios rather than accepted as a single forecast.
Property investment analysis must separate market data from the calculation for the specific asset. TCMB publishes the House Price Index to track housing-market price movements and, in 2026, began publishing the New Tenant Rent Index to capture new-rental price developments more quickly than rent measures that include existing contracts. These indices do not provide the sale price or rent of one unit, so they must be combined with verifiable local comparables. The review becomes useful when the finding is tied to a defined effect on rights, price, cost or executability and backed by evidence that can be rechecked later. Turn the review topic into provable facts: identity, date, amount, registry status, document or technical condition.