This is another incomplete mandapam.  The Mandapam is at a height reached by a few small steps.  There are two rows of pillars, the outer row of pillars have a sitting lion as the base.  

Here, Mr.Swaminathan indicated the square cut marks that had been made, a stage in breaking up of the rocks.  The passages on the sides of the mandapam indicate that a prakaram (the passage going round the garbagriham) was being excavated.  The two sides passages have been carved out with a row of pillars in the middle.