All condor-class light carriers started their service lives as Tarsus class freighters. The conversion process is an involved and complex affair and requires proper space dock facilities.
Some in the sector argue even the Domain, with all their technological know-how, relied on conversions of this type to make more efficient use of a merchant fleet during times of escalated hostilities. Others point out that it is unclear how ubiquitous this approach was - there could have been fleets of Condors roaming Domain space, but there is scarce evidence one way or the other. Such details were all lost in the Collapse.
Nowadays the Condor-class sees heavy service in the Sector as the conversion is, for many, the easiest way to procure carrier capability for their organization. Even with limited flight deck space, the Condor gets the job done, relying on its tough armor, excellent bulkhead strength, and a respectable (for a light carrier) weapons package.