TSP loan for rental

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I currently have a rental in nc and owe 98k at 4.5%. rental income is $700. I am breaking even since 2008. I wanted to pay the loan off by using TSP loan and pay tsp loan in 2-3 yrs. I can then refinance and buy another property. Is this a good Idea? I will get about 2% interest payment to self on TSP but may lose whatever income I get in the next 2-3 yrs. Most of my friends think it is a bad idea. Please advise. Thanks