I typically do pre-planning with clients coming on board to discuss their specific situation and formulate a plan.The best assets are receiving multiple offers these days and go quick.

Quote from @Hazel Anderson: Hello, bigger pockets pros, We have a rental property in Columbus and we are looking for a contractor who can replace the existing basement window with a standard sized window.

Is it like the following:a)  Make an offer on a 5-unit that the Seller acceptsb)  Do my inspections, come up with gameplanc)  Present the lender with final gameplan, once approved then proceed to closing & get the keysd)  Have XX days to convert to a 4plex?

Keep the great content coming!

I'm trying to decide whether it's better for resale purposes to add one 8x12 master bathroom, or split that 8x12 area and instead add both an 8x6ish bathroom coming off of the master bedroom and another 8x6ish bathroom coming off of the 5th bedroom.

Generally, when people "make it" they want to share their good fortune with others and they understand that whatever they give freely comes back to them tenfold.

The biggest reason I would advocate for mixed use is for the reasons you mentioned, the leases are longer, but also the general "issues" around tenants on the residential side don't come into play as much or at all. 

Lower Start-Up CostsTraditional real estate investing requires 20%-25% down, making it difficult for many to scale quickly.

One thing you will want to explore is the tax rate in the specific counties you are looking in.

What you can require legally changes depending on your location. - If you make the above clear in the listing, you will immediately get fewer applicants.