The Measurements is a powerful statement of ownership. The golden reed is a symbol of those through whom the Spirit flows to bring illumination to the nations. This is a divine tool, symbolized by gold.
The measurement of the city speaks of the perfect fullness which occurs as the bondservants of Christ are joined in unity with the entirety of the Godhead. The wife of Christ will be perfect, full, complete, stable, and fully imbued with the fullness of the Godhead.
The measurement of the walls depicts the completeness of Jews and Gentiles. Combined, the city, its gates and its walls provide us with a picture of all those who even now arefound to be believing and overcoming. This structure speaks of community, fellowship, and connectedness (the city), exclusivity but also access (the gates), and safety, stability, and security (its walls).