court before the appointment of a receiver and the entry of the demolition decree. In Logan, an action to vacate a demolition decree, service by publication was held adequate notice, but the reviewing court, aided by the decree and the record of proceedings from the court which ordered demolition, based its decision on the circumstances of that case. As we have mentioned, in this case the record of the demolition suit is not before us, and an appellate court will not take judicial notice of a record in another court unless it is incorporated in the proceeding before it. Neumann v. Ellars (1966), 75 Ill.App.2d 394, 221 N.E.2d 85.
If the City did indeed make diligent inquiry, that would be a matter easily proved by evidence within the City’s control which, since this case will be remanded, we would expect to be adduced at the next trial. Inasmuch as our order will be one of remandment, a further word is due on the treatment to be accorded an affidavit of diligence, should it be produced. Such an affidavit does not foreclose further inquiry. Courts will, if necessary, look behind the document’s allegations and if they do not speak the whole truth, jurisdiction will not obtain. (City of Chicago v. Moran (1974), 17 Ill.App.3d 515, 308 N.E.2d 324; City of Chicago v. Leakas (1972), 6 Ill.App.3d 20, 284 N.E.2d 449.) In Leakas the evidence showed that the City’s process server had not made a serious, well-directed effort to locate a building owner; as a result the demolition decree was voided, notwithstanding the presence of an affidavit of due inquiry. Similarly, mere proof that the City filed such an affidavit in the March 1967 demolition proceeding would not conclude the issue of negligence.
The City next asserts that Thornton is not entitled to relief because of its own failure to intervene in the demolition action upon receipt of the report of title which disclosed that the property had been condemned and upon its own inspection which revealed the building was still standing. The City cites Shippert v. Shippert (1939), 371 Ill. 267, 20 N.E.2d 597, but that case affords a poor analogy to the present one. Shippert pertained to a petition to set aside a decree partitioning certain lands. The decree was denied, because while the complaining party had not been served the required notice of the filing of a counterclaim, he had already appeared in court prior to its lodging and then apparently abandoned the proceeding. Thornton, on the contrary, did not receive actual notice until after the entry of the demolition order.
Furthermore, Thornton’s evidence was that when it finally received notice, the property had fallen into such a state of disrepair that its rehabilitation had become uneconomical. True, a Thornton partner ac-in his testimony that at the time of purchase, the building was in substantial disrepair; and Thornton then ignored it for nearly 2