So, you bought a house for $1m and a year later someone offers you $900k for it. Will you sell it? Why should you? If you're not in debt, have money to pay your bills, you won't sell it, right?
A person who bought house for $1m and sold for $900k within the interval of 1 Year must really be insane or could have involved in a financial challenges. But no matter what, selling asset to quickly earlier than expected is not Good because it will lead to selling at Lost. So if you ask me I will say i wouldn't sell it until I meet my set target or probably allow it to compound.
But as a good investor, I don't think is a good idea for someone to bought a house of $1m and sold it $900k because there is no profit in that investment. There are some things that will make investors to take such a foolish decision, suchas financial crisis, pay back loan and house rent which are the major issues that will push some investors to take unwise decision.
Since you Invest for you to meet up with your target in that house, which is the reason you will not sell until you discover that there is a good profit if you sell the house, before you can take a bold step to sell the house.