That said, Solo 401(k) with Roth component can be powerful and does open up the discussion with your CPA or tax pro about paying yourself more (within reason), in order to make higher contributions. 

It's an incredibly powerful form of leverage.

This is what I typically use for my SFR direct mail campaign to landlords. but if you are targeting multifamily more likely they will have tenants in place, so that statement is not as powerful for your audience as it is for SFR landlords, that sometimes is hard to sell a property with Tenants in placeI hope that helps a bit

This quick turnaround showcased the power of market timing and effective negotiation, doubling the initial investment in just one day.

Refi'ing into a 15yr loan is likely to both increase your effective rate and crimp your future buying power by increasing your DTI. 

And if a family office will demand more power and ability to change things to their own liking.

In truth you don't have a lot of power over when and if she pays, but you can and should use the power you have.We have this clause in our agreement and we talk about it before they move in so that they are clear who the primary is and what that means. 

This is what makes it so powerful.

The power of REI in todays market is delayed gratification  combines with the tax benefits the following year. 

Consider working with a lender to get pre-approved for financing, as that will give you an idea of your buying power.