I offered $52k and seller accepted, multiple contracts fell through already, I was told.

It sounds like they have multiple complex issues going on they cant solve to move it.

You can get a blanket loan for all the 4 units if they are separate owners.Even if they're purchased in separate transactions with multiple owners, you still should underwrite the whole portfolio as one for future projections, depending on your exit strategy.How you present the proforma and executive summary to the lender will depend on how you purchase the assets.

My end goal is acquiring multiple properties as mentioned in the Bigger Pockets article “A Slow, Boring, Incredibly Awesome Strategy...Real Estate Investing”.

Separate studio or one BR unit with separate entrance,  aka "Granny Suite" for multiple purposes including a place to keep for yourself private when renting the rent of the house.

So multiple obstacles, but I am determined.

Since they are turned multiple times every day, you don't want to go cheap on a door knob.

Did you call around for local contractors and have them come see the property and compare multiple estimates?

He has multiple LLCs registered and has hundreds of properties under them.

Am I getting myself into trouble with refinancing having multiple properties on one lot?