Information for real estate market analysis is being provided mainly through three basic procedures ñ project-specific data collection, agents' reports and large country/city samples designed to benchmark management and compare returns with non-real estate assets. The former is becoming less important as the other two become weightier references for analysis. It seems that space analysis devices (such as GIS) and methods (such as space syntax) can contribute to define intra-urban space boundaries that constitute a geographical reference for sampling. Within these boundaries building categories can be conceived and sampling referred to each of them. Property-owners' collaboration is a core feature of this procedure, but some difficulties are to be met there. An international cooperation network for the implementation of the procedure would be welcome and would make it more attractive to some types of property-owners.