During the recent period of low interest rates I acquired some rentals with a 15% down payment in order to stretch my cash further toward down payments on additional properties.

This helped with the down payments and my math showed that even with a little higher interest rate compared with 20% down and the PMI until I was able to remove that this would still be the wiser choice.

Due to the market appreciation during the last few years of regular payments I was able to remove the PMI from all loans except for one. It was admittedly somewhat of a frustrating process and I got the impression that lenders purposefully make it challenging to remove and do the bare minimum to meet the federal guidelines for removal (very slow responses to PMI removal inquiries requiring multiple follow ups, incomplete or missing information on the process of removal or borrower rights, calculating LTV incorrectly, etc, etc). This was not unique to a specific lender but some made the process easier then others for sure.

Anyway, I am now approaching 75% LTV (based on initial purchase price) for the last investment property with PMI so I reached out to start the process and was denied with no explanation. When I followed up and asked for a specific reason (thinking it might require an additional payment towards principle to put me under the threshold) they wrote back informing me that investment properties do not qualify for automatic termination and that PMI will remain for the life of the loan and if I want to remove it I can look into refinancing.

This is a conventional loan so my understanding was that I could request the removal of PMI once I got to 75% LTV (as opposed to 80% with a primary residence) as this was the case with the other properties. If I'd know that I'd be paying it for the life of the loan I would have been better off paying the extra 5% down payment and enjoyed the lower interest rate but I don't recall ever being informed of that or reading it anywhere in my documents. Refinancing doesn't make sense as I'd effectively double the current interest rate and have additional closing costs surpassing the PMI.

Am I stuck paying PMI like the lender says or are they somehow mistaken? This is not a multi-family unit and was purchased in the last several years if that makes any difference.