Does a portfolio loan typically have a due on sale clause?

[Hutcherson Yearwood]

I am strategizing on ways to acquire a new property. Here is the lay out. The property is a multi-family with an asking price of about 80K. The rents are currently $800 for one unit and $630 for the second unit, both units are occupied. The taxes are about $3,000 per year. The owner stated that three properties in different cities are on one loan. I am wondering if I can (1) assume the loan aka take over the payments and pay the owner a lump sum in addition. (2) Maybe I’m reaching, ask the owner to do some seller financing. Or (3) something else creative that I am not aware of to allow both of us to have a win.

Ps: This will be a hold for my team.

I thank you in advance.