Alan owns two properties. One of the properties is situated in a residential building (“the Flat”) and the other is in a

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Alan owns two properties. One of the properties is situated in a residential building (“the Flat”) and the other is in a commercial building (“the Unit”).
Regarding the Flat, there is a sitting room and a master room. There is a partition wall between the two rooms. According to the Deed of Mutual Covenants of the building (“the DMC”), the partition wall is a load bearing wall. The DMC also assigns the exclusive use of the Wall to the owner of the Flat.
Allan is considering to sell the Flat. With a view to negotiate for a higher selling price, Allan has come up with the idea of removing the Wall so as to make the Flat look bigger and more spacious.
Concerning the Unit, Allan has set up his business in it for 20 years. To facilitate its use, Allan has partitioned the whole Unit into two rooms by erecting a partition wall in it (“the Block”) without approval from the government. Beauty is a co-owner of the commercial building. She has reported the matter to the incorporated owners of the commercial building (“the IO”).
Required:
Explain to Allan, firstly, all issues involved in the problem scenario; secondly, all actions, including legal actions, Allan may need to face; and thirdly, all defence, if any, that are available to Allan.