At least 1,135 people were killed and over 2,500 injured when the eight-storey building, housing five garment factories, at Savar on the outskirts of capital Dhaka collapsed on Apr 24, 2013.
Savar police opened a case of culpable homicide and Capital Development Authority (RAJUK) filed another case for the structural fault in the construction of the building the same day.
Rana Plaza owner Sohel Rana, his parents and 14 others stand accused in both the cases.
Two Dhaka courts are scheduled to hear the first two cases on Apr 28 and fix the date for framing charges.
The Anti Corruption Commission, too, prosecuted Rana, his parents and several others in 2014 alleging irregularities in the construction.
The High Court has also issued a rule on its own volition and several orders following writ petitions on the incident.
The antigraft agency has been ordered to submit the new investigation report by May 8.