John Gill Commentary 1 Chronicles 28:11

"Then David gave to Solomon his son the pattern of the porch [of the temple], and of the houses thereof, and of the treasuries thereof, and of the upper rooms thereof, and of the inner chambers thereof, and of the place of the mercy-seat;" — 1 Chronicles 28:11 (ASV)

Then David gave to Solomon his son the pattern of the porch ,
&c.] The breadth, and length, and height of it, which was to be placed at the east end of the temple, and was the entrance into it:

and, of the houses thereof ;
the holy place, and the most holy, which latter is called the greater house, (2 Chronicles 3:5) ,

and of the treasures ;
where things belonging to the temple were laid up, the priests' vestments, and other things:

and of the upper chambers ;
where the priests lay or met for conversation, (Jeremiah 35:2) (Acts 1:13) .

and of the inner parlours thereof ;
where the priests ate of the holy things; all these seem to he buildings against the wall of the temple round about, (1 Kings 6:5)

and of the place of the mercy seat :
the holy of holies, where that, with the cherubim over it, and the ark under it, were placed.