HOPA does not apply to non-owner occupied property. It only applies to the principal residence.
(14) Residential mortgage
The term "residential mortgage" means a mortgage, loan, or other evidence of a security interest created with respect to a single-family dwelling that is the principal residence of the mortgagor.
(15) Residential mortgage transaction
The term "residential mortgage transaction" means a transaction consummated on or after the date that is 1 year after July 29, 1998, in which a mortgage, deed of trust, purchase money security interest arising under an installment sales contract, or equivalent consensual security interest is created or retained against a single-family dwelling that is the principal residence of the mortgagor to finance the acquisition, initial construction, or refinancing of that dwelling.
The PMI must be terminated, provided the account is in good standing, either when the outstanding balance reaches 78% LTV of the original value of the property based on the original amortization schedule, or when the loan reaches the midpoint of the original amortization schedule. Whichever comes first. To the best of my knowledge this applies to both fixed rate and ARM loans.
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The opinions expressed are mine and they are not to be taken as legal advice.