I've had Built to Sell: Creating a Business That Can Thrive Without You on my reading list for far too long. It has come recommended to me from several of my other business-building friends.
Buy Then Build: How Acquisition Entrepreneurs Outsmart the Startup Game by Walker Deibel focuses on the idea of an acquisition entrepreneur. It took me far too long to read this book as I was only reading it during my coffee breaks sporadically.