Hi,
Your personal living space is going to have the most affect for you. The 20 year disaster star on the front door of the whole building will have a slow affect and build over time. In that case, it is important that you activate your best directions and do what you can in your own personal living space. Remeber, energy flows where attention goes. You can cure what is in your space and then ultimately concentrate on what you would like to move toward in your life. There is no such thing as perfect feng shui and even the less than ideal stars can be transformative. Trying to avoid difficulties in life only gives more energy to what you don't want.
If the building is good, you like your personal apartment, you have things in place to support your growth and well being and you've cured what you can, you are in a good position.
If you feel called to, you can place a cure for that illness star in the corresponding direction in your space. It's intention that drives this process. As you place the cure, hold the consiousness for well-being, vitality, whatever you describe and know health to be. Remember when you state outcomes and intention, keep the language positive, go directly into what your intention is for the objects you have around you.
All the best!
Kat