Will I have to pay DC taxes?

I am a resident of Florida where I live more than 7 months out of the year.  I don't own property.  When I am there I stay with my elderly parents.  The rest of the year I am in Washington, DC.  I want to buy a small apartment there for when I am there for 4-5 months.  I know I won't be able to take the Homestead Exemption on the property taxes since it won't be my primary residence, but will I have to pay taxes to DC?  I don't plan to rent the apartment so there won't be income.  But I am concerned having a property there will make me a "resident" and I'll have to pay income tax for my job in FL.  Thanks for any info you can provide.