Revocable Trust Tax Return Issues

Hi! I'm Trustee of my father's revocable Trust. At the time of his death in September 2010, assets amounted to about $1.5 million (mostly real estate). A beneficiary and her "friend" sued the Trust relentlessly, however, both cases have been dismissed as "frivolous and for no purpose other than harassment." Legal fees for defending the Trust were $325,000, and while in litigation, the Trust continued to pay mortgages, all utilities, and property taxes on his 3 properties. Consequently, cash reserves took a huge hit. In 2013, the court approved the distribution of 1 home to a beneficiary (per terms of the Trust). Currently, there is no longer cash reserves to pay off mortgages on the remaining homes, until one of the properties is sold. The "profit" from the sale will be less than $30,000. Federal and Illinois tax returns were filed the year of my father's death for both him (personally) and the Trust. However, I have yet to file returns for the years following in which the Trust funds lost value. Aside from the funds which transferred to the Trust after my father's death, as indicated on the initial Tax returns, income for the Trust was $13,000 in total (from stock that was liquidated the following year). This income was offset by costs related to maintaining properties (mortgage, tax, utilities, etc.). 1) Do I need to file a Tax Return for the Trust if it did not have income? 2) Are the legal fees for 20deductible? 3) If the Trust incurred losses, are there any Tax credits that would provide a refund of any kind? 4) If a filing is required, can the 2 years (2012 and 2013) in which it lost money be filed in a single return? Your feedback is greatly appreciated!!