Complex sentence: Interestingly, the original location of the Eastgate Park building is now a mystery--a thorough search of city building records only returned the building permit that allowed the building to be moved to Eastgate Park.
Split into simpler sentences: Interestingly, the original location of the Eastgate Park building remains somewhat of a mystery. A thorough search of city building records only returned the building permit that allowed the building to be moved to Eastgate Park.