laboratory building; research lab block
Refers to a building or a distinct wing/block of a university or research institute that contains laboratories.
The new laboratory building is scheduled to be completed next month.
His office is on the third floor of the research lab block.
研究室 refers to an individual laboratory or a professor's research group, while 研究室棟 refers to the entire building or wing containing multiple such laboratories.
実験棟 is a more general term for an experimental building, which may include non-laboratory facilities, whereas 研究室棟 specifically houses research laboratories.
Compound of 研究室 (けんきゅうしつ, 'research laboratory') and 棟 (とう, 'building' or 'wing').