I have taken a different stance on this. Typically, when a manufactured home is used as a beginning 'shell' to a much larger site built dwelling, the manufactured part is no longer significant and has become a 1-4 in all practicality. it no longer truly meets the definition used below in Appendix C.
(i)
Manufactured home means any residential structure as defined under regulations of the Department of Housing and Urban Development establishing manufactured home construction and safety standards (24 C.F.R. 3280.2).
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My opinion only. Not legal advice.
Say you'll haunt me - Stone Sour