Most improvements are to support leasing efforts. Why waste time showing available space when it really doesn't look presentable? With some upfront money you can increase the odds and collapse time frames by making market ready improvements such as cleaning, general repairs, painting and fixture upgrades. Depending on the budget there is alot we can do to eliminate negative attention and capitalize on every opportunity so you don't waste precious time.
Do you have a security deposit to work with? Don't loose another months rent, put that money to work.