The completion of Israel's massive building era marks a major turning point during Solomon's reign. After two decades of heavy investment in national and religious infrastructure, the kingdom needed to settle its international debts, particularly with Hiram, the king of Tyre, who had supplied expensive raw materials throughout the project. The twenty-year period serves as the exact completion of this era [רד״ק, ביאור שטיינזלץ]. The primary approach among commentators is that this timeframe combines two distinct building phases: seven years dedicated to constructing the House of God, and an additional thirteen years spent building the king's palace [רש״י, רד״ק].
Establishing this timeline sets the stage for the economic relationship between the two kings. In return for Hiram's extensive assistance in supplying cedar wood, cypress wood, and gold over the years, Solomon decides to reward him by granting him twenty cities in the Galilee region. However, this transfer raises a fundamental issue, as giving territories within the Land of Israel to a foreign ruler directly contradicts Torah law.
To resolve this difficulty, two main explanations are offered. One approach views the transfer as a diplomatic exchange of territories designed to strengthen the bond of peace and brotherhood between the rulers. According to this view, Solomon and Hiram traded twenty cities with one another. The Book of Kings focuses on the cities Solomon gave, while the Book of Chronicles completes the picture by detailing the cities Hiram gave in return [רד״ק].
Conversely, others reject the idea of a permanent land exchange and instead propose an economic and legal arrangement. In this scenario, Solomon never gave up absolute ownership or Israeli sovereignty over the cities. Rather than continuing a fixed annual payment for the supplied timber, Solomon established a more efficient system by granting Hiram agricultural rights in the fertile Galilee. The servants of the king of Tyre were permitted to work the land and collect the annual harvest of wheat and oil directly from these cities, while legal control and true sovereignty remained firmly in Solomon's hands [אברבנאל, מלבי״ם].