When selling a house, an owner has a choice about whether to sell the house "as is, where is" or to do it up before putting it on the market.
It might seem like an unnecessary amount of cost and effort to replace the kitchen, bathroom, and 20-year-old carpet when you won't be the one who is around to enjoy using it. Why not just let the new owner put things in how they want them?
But not everybody in the market to buy a house wants to go through the whole effort of a significant renovation. Those that do are probably DIY renovators looking for a bargain. The number of people willing to take on a significant renovation while paying full value is much lower.
Given the choice, many people think it's easier and better to build their own home exactly as they want rather than try and retrofit it into someone else's home and clean up someone else's mess.
Similar issues apply when selling a law firm.