I help run a community laundry night in my town and a common complaint is that there are never any available machines in the large complexes...so maybe if a machine is available they cram it full trying to get all their laundry done at once. 

@Jamie BraytonI think the most easiest scenario is as follows.You and your husband purchase the property you will flip as either tenants in common or as an LLC.

A lot of questions here...As your dad has a 50% interest, and a trust owns the other 50% of which you and your two siblings are the sole beneficiaries (I presume), it might be advisable to, after the trust interest is distributed, to have your father, you, and your siblings contribute your interests to an LLC in exchange for shares of the LLC (usually called "units").The property would be re-titled in the name of the LLC and the LLC can use it as collateral for a loan.It's usually highly advisable to engage an attorney to draft an operating agreement in this scenario to get everyone on the same page about ownership interest, who is/are the managing member(s), what happens when someone wants to sell -- do the existing members get 'right of first refusal', what happens if a member passes away, etc.

Very common to use for investing.

I am wanting to keep as rentals or wrap and sell with OF and both would work for that scenario and cash flow a minimum of $300/mo after expenses and debt service. 

Does that 9 bed figure include some common area spaces counted as bedrooms?

Also, is it common for the owner of a multi-unit property to state that a potential buyer cannot view the inside of a property because they don't want to disturb the current renters?   

Replacing 4 or 5 sheets of plywood is common . 

Worst case scenario, he says no and you can just send him an offer.

@Brian Detlefsen it's pretty common in apartment complexes to have them pole mounted.