To hold on to his property he would have to come up with millions in new cash to buy a new rate cap at 3%.
Much worse than that, he would have to come up with millions even without buying the old 3% rate, just for the new 7% interest rate he would need several millions out of his pocket when he's forced to refinance, to be able to hold on to his property.
Lets say the property's cash flow enabled him to make payments of $90k monthly, at the time when the rates were 3% that would cover a loan of $21M, which the bank gladly lent him as the property's performance made sense for that amount. Now that the rates went up to 7% and the guy is due for a refi, even if the property's monthly cash flow increased lets say to $120k with the rising rents, he'd only be eligible for a $18m loan with the new rates, forcing him to come up with another $3m out of his pocket to avoid foreclosure.