Solomon was sparing no expence at the building of God's temple.
He even used cut stones to lay the foundation, which would never be seen.
God liked what He was seeing so He spoke to Solomon to encourage him.
What God told Solomon, however, had nothing to do with the building.
He knew Solomon was building a temple for His presence to remain, so God reminded Solomon the true cause of His presence remaining.
It wasn't because the building was so nice - it was due to obedience to God's commandments.
God's presence would not fill the incredible building Solomon built unless God's people obeyed His commands.
God's presence in our lives is the same way - no matter what type of "good" you're doing in the world it won't bring God's presence - only obedience will.