The companies’ trade registration records, if the company is a party of a lawsuit or enforcement can be checked by lawyers.”.
The old projects of the same company can be also checked. This all gives clue to the investor.
Also, As mentioned above, the construction companies show to their clients the detailed models and catalogs of the projects.
In practice, we are facing some situations that the projects in the catalogs are not always real. Therefore the official projects must be checked in the deed, as well.