Yes. You are a US citizen and as such you are required to file the same tax return that you have always filed claiming all of the income that you earn worldwide.
You will be able to claim a foreign earned income exclusion for income earned outside the US or you can claim a foreign tax credit for taxes paid to foreign countries that is taxed by the US. But the income earned from US sources - like your rental income - is taxed the same as if you lived here.
In order for TurboTax to function you will need a US address and phone number. You may want to find a friend or relative that will allow you to get mail at their home before you leave the country so that you can use that address to file your taxes.
@ShajeerN
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