Deduct 100% of Home if live somewhere else

I have a home business, and it is growing, so I was thinking of maybe renting and living there using 100% of my mortgaged home as the business.

 

I guess I could rent and write off 100% of it, but I would think writing off the mortgage would be worth more.

 

I use Simplified deductions.

 

Is this possible? I feel this would be a huge red flag, though I am OK with any audit, just it can be time-consuming, which means less time running a business.