N-400 part 7 help

[goobz]

Hi - I am a freelance Illustrator who receives both W2 and 1099's, I work both on site at different advertising agencies and from home but I don't write off my study at home as expenses because I write off my mortgage interest instead. I just need some advise on how to complete this part of the n-400. Should I fill in various ad agencies I freelance for or should I put in my home address ?

Thanks in advance!