Mo. Rev. Stat. § 513.210: Real estate to be divided, when — amount to be sold.

When an execution shall be levied upon real estate, the officer levying the same shall divide such property, if susceptible of division, and sell so much thereof as will be sufficient to satisfy such execution, unless the defendant in the execution shall desire the whole of any tract or lot of land to be sold together, in which case it shall be sold accordingly.