代案

だいあん

Common word

noun

•

alternate plan

代	substitute, change, convert, replace, period, age, counter for decades of ages, eras, etc., generation, charge, rate, fee
案	plan, suggestion, draft, ponder, fear, proposition, idea, expectation, worry, table, bench

けんちく

たちば

、

おお

だいあん

かんが

From the standpoint of architectural design, there can be more alternatives to this approach