"carefully selecting investments, selling assets and strengthening control of working capital such as inventory."
Is it possible that Sony made, or is still making, the same mistake that everyone who used their house as a checkbook in the run up to the great economic dry heaves of late? Somehow I doubt it and this is PR using the term asset to mean a money sink that some other fool will think is valuable. Let's be honest, on the balance sheet the real difference between an investment and an asset is pronunciation just like the twins liabilities and expenses on the other side. Put another way one side is the stuff that makes money and the other side is the stuff that takes money.
A corporate HQ is just like your house and it shouldn't be placed on the asset side of the sheet ever because it doesn't produce an income. I know some folks like to think the value goes up and therefore it's an investment but it isn't because you have to live somewhere and if you're lucky the best you get is to sell the big house, move into a small house and hopefully have some cash left to visit [insert warm place or grandkids here] every year. Sony has the same issue, the McMansion they bought it a little too big for them to handle so they are going to move to a cheap cottage they can afford. It's an indication that unless Sony can turn it around, these are their twilight years.