Mo. Rev. Stat. § 429.040: Buildings on same or adjacent lots.

When the improvements consist of two or more buildings, united together and situated upon the same lot or contiguous lots, or separate buildings upon contiguous lots, or a continuous or connected sidewalk in front or alongside of contiguous lots, and erected under one general contract, it shall not be necessary to file a separate lien upon each building or lot for the work done or materials furnished in the erection of such improvements.