First of all you should remember that your brother and other legal heirs of your deceased mother are entitled to an equal share in the property left intestate behind by her.
Assuming that you and your brother are the only legal heirs to our mother, do you think he cannot claim rights for equal share in your mother's property?
If you have invested money in renovating the old building, it is for your convenience and comfortable stay in it that you have spent money on it, did you take the consent of your brother then?
Though you say that you spent money on its renovation you had enjoyed the fruits of it so far hence it is not a loss for you. Legally you cannot claim compensation for this.
He cannot forcefully evict you and sell it off to somebody even he is selling his share in it, he can approach court for partition of the property and only after proper partition by court that he will be able to sell his share in the property.
If your brother indulges in any undesirable activity to dispossess you from the property, you may file an injunction suit against him to restrain him from doing so and he may be instructed to file a suit for partition by observing due process of law. This will be the only relief available to you.