7:10a The foundations were laid with large, costly stones,

He laid/made the foundations with large, high-quality stones.
-or-

⌊Solomon had his workmen⌋ construct the base of these buildings using the best large stone blocks ⌊that one could find/obtain⌋.

7:10b some ten cubits long and some eight cubits long.

Some ⌊of these foundation stones⌋ measured eight cubits and some measured ten cubits ⌊in length⌋.
-or-
These blocks measured from four to five meters across.

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