Although the question has some vagueness in its conditions there are some further points which might be of interest. In addition to the Thermodynamic property of Entropy mentioned in the other answer we also have the property of Temperature and its Thermodynamics to consider.
The object will (a) approximate a Black Body and will emit thermal radiation reducing its energy over time; and relatedly (b) equalize to the Temperature of its environment.
If we take the environment to be somewhere of the same Temperature as the object initially, then that environment will require an infinite amount of energy over time just to remain at that Temperature. So this is arguably unrealistic. The second law of Thermodynamics will also begin to apply in this environment as some atoms are evaporated from the surface of the table, increasing the entropy and destroying the table.
If we take the environment to be deep space then (at 3K) the table will equalize to that Temperature. This will affect the steel/wood structure of the table: it will become more brittle over time. Any external energy (ultimately even from photons) will tend to fissure then fracture the table.
An interesting application of this question is to the formation of the materials surface of space-craft (like Pioneer) which need to stay in space indefinitely. Similar effects will happen here. Generally such spacecraft have an internal power source to keep going, but I dont know how much longer they will survive.