‘The glory of Lebanon will come to you,
The fir tree, the pine and the box tree together,
To beautify the place of my sanctuary (‘my place of holiness'),
And I will make the place of my feet glorious.
The point here is that just as Solomon's Temple was built from the trees of Lebanon so will it be again. But this time the providers will come gladly because of their love for Yahweh. There will be no charge for the supply here, and they will provide the very finest. The desire of all will be to make God's dwellingplace beautiful and glorious, for it is His holy place, the place where He puts His feet (His footstool). It is His place of contact with man (compare Psalms 99:1; Psalms 132:7; Isaiah 66:1; Lamentations 2:1).
This may partly be seen as partly fulfilled in the building of the Second Temple and of Herod's Temple in all their glory, for both of which timber flowed in from the Lebanon making the place of His Sanctuary beautiful (see Ezra 3:7), but it goes on to express the idea of the Temple of His people, built up of all that is precious (1 Corinthians 3:10-16) and the final idea lies in the Sanctuary of the heavenly kingdom which will be blessed in the wholehearted worship of His people, founded on the Apostles and prophets, and built up from His people (Ephesians 2:12-22; Revelation 21). There will be no Temple there for YHWH Himself will be its Temple (Revelation 21:22). It will, however, be His sanctuary, the place of His holiness..
The trees are not strictly identifiable although the general idea of what they were is known. They were the trees of Palestine and Lebanon, not of Babylon.