If I was looking to do a quick flip I might partner up because I'd be seeking a complimentary skill-set.

The GC could be a complimentary to the brokerage business.

My library has an ebook platform where I can borrow tons of books on my phone as audiobooks for free.

We’ve got some complimentary wines from the Llano Estecado wineries.

Finally, if you can't find what you're looking for, try the Bigger Pockets Fileplace: https://www.biggerpockets.com/files It contains hundreds of files such as ebooks, checklists and spreadsheets for real estate investors.

Eventually, I would bet that they add some kind of child day care or complimentary services to add alternate revenue, while at the same time attracting their demographic.Their are 8 billion humans, if you think retail will die, you don't understand retail or human nature.

I have Mike's eBook, too.

I have taken to painting that lower section in a darker complimentary color because is hides scuffs and kids fingerprints better.

Sitelink has an open API with a number of add on complimentary programs like automated collection calls, integration with website developers and call center integration.Each program is very good and definitely worth exploring further.

@Jay Hinrichs has a ebook for out of town investors.