So you pay off your mortgage which you stated is your goal. So now your return is 6000/850,000 Which is basically the same as a bank account, also means you have a worse rate of return then inflation!
You are losing a crap ton of money on this. Yes you are 'making' 6000-ish a year. However the money you have tied up in this house would be absolutely crushing your return in pretty much any other investment vehicle. Not to mention that you lose the tax exemption. So you get to pay taxes ON THE ENTIRE GAIN.
So you can keep doing what your doing and lose money every week, and then when you sell you can lose another 100k in capital gains taxes. You made your money on appreciation, any attempt to rent this house out is going to cost you money.
I am not trying to be rude here, but please tell us how this is a good investment? Would you lend someone 850k at 1% return? Hell no you would not. Would you buy an 850k annuity at 1% return, hell no you would not. If you were to have this house as an even half way decent rental rent would need to be north of $8,000 a month.
Sell this sucker, and enjoy that awesome gain (tax free!)