Now set your heart and your soul to seek the LORD your God; arise therefore, and build you the sanctuary of the LORD God, to bring the ark of the covenant of the LORD, and the holy vessels of God, into the house that is to be built to the name of the LORD.
Read Chapter 22
George Leo Haydock
Is on the point of being built. David was convinced that the work would not be much longer retarded, so that he speaks of it as present. (Haydock)