How many rows of pillars did Solomon's house have?

Three rows, with 15 pilars in each row

But Solomon was building his own house thirteen years, and he finished all his house ... And it was covered with cedar above upon the beams, that lay on forty five pillars, fifteen in a row.1 Kings 7:1-3

Four rows of pillars

He [Solomon] built also the house of the forest of Lebanon; the length thereof was an hundred cubits, and the breadth thereof fifty cubits, and the height thereof thirty cubits, upon four rows of cedar pillars 1 Kings 7:2