Yes, you can. Let's count it as a suite, because your accounts are separate. At present, it seems that your lover can only buy a house with a commercial loan. I don't know whether you bought a first-hand house loan or a second-hand house loan. The maximum loan amount for a first-hand house is 70% of the property value, and that for a second-hand house is about 50%. In other words, the first-hand housing loan down payment needs at least 30%, the second-hand housing down payment needs more than 50%, and some banks need about 60%. Commercial loans to buy a house, the interest rate of less than five years is 6.9%, and the interest rate of more than five years is 7.05%.

Because everyone's situation is different, I suggest that you submit a free application for qualification evaluation through a professional loan website, which can help you evaluate how much you can borrow, how to borrow, how much the specific interest is, and what institution to borrow from. If the conditions are right, I can help you recommend it to a lending institution.

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