I restarted my loan so I'm paying for the interest that's front loaded and the money is only making 2% in savings while I shop so there is a cost to this method.

We've been debt free for about two years now and having that peace of mind is a huge weight off our shoulders. 

It’s your time, mental load, creativity, connections etc..

Potential issues that you might want to look into are zoning, the structural stability of the building if it is multi-story (flooring, people, appliance add a lot of weight per sqft).Depending on what type of construction the warehouse is (Pre-engineered metal building, block, bar joist, or structural) you might have good luck partitioning areas off for contractors, light manufacturing, etc.

Example: If there is a bathroom located directly above, a toilet back or burst pipe could cause the ceiling to collapse from the weight of the water.

This will help reduce the % when they calculate your debt load.

It would be a simple removal of a non-load bearing wall.

@Freddy Neuhold it sounds like you will have to weight the pros and cons of using the owner occupied loan versus investing the old fashioned way by saving up 25% down.

I tried to take a look at that link but it won't seem to load. 

@Douglas Montgomery, I couldn't get the link to load, but if you want to list out the numbers below.Income - Expense = NOIExpenses must include:maintenance & supplies taxesinsuranceproperty managementcap-ex reserveslawn caretrash serviceutilities (if owner pays)snow removal (if required)internet (if provided)security system (if provided) advertisingThen subtract debt service from NOI to calculate Cash Flow.Also, NOI / Total Capital Invested (purchase price + rehab + closing costs + holding costs) = CAP Rate