Since you didn't know what form to put the activity on, I am a little concerned that you have done proper allocations of expenses since you said half the property was being occupied by the client.  Have you properly calculated depreciation?  Do yourself and the client a favor, stick to returns that you are comfortable preparing.  You may end up shooting yourself in the foot and wound the client with the same gun shot when you prepare returns that you don't have the proper background to undertake.  We are all good at something, do the things you are good at and leave the rest to someone else