The valuation process which results market value of real estate is based on the data involving both transaction prices and characteristics of a given transaction object. Features characterizing real estate, affect on variability of prices and in this case their accuracy directly influence on the result of valuation. The description of the transaction object in the notarial deed mainly involves the legal status of real estate while its physical features are usually omitted. This information can be supplemented on the basis of the collections of data contained in real estate cadastre, reconnaissance, data collections included in surveying documentation centres or information possessed by departments of architecture and civil engineering of municipality offices. However, such supplementation is timeconsuming and costly. The active databases presented in this paper can be used in the valuation process as a source of information on real estate being the object of transactions, which will considerably improve the quality and accuracy of the obtained valuation result. ...
