Shall we sell our present apartment for 10 days, as we have to move to another, which we have bought already?

Our present apartment is o the 8ht floor out out of 8ghts, it is 84 square meters big and is in a good shape. However, people are reluctant when they saw that it is so high, although I think it's not such a disadvantage. We need money to complete the financial construction of the new one, so that's why all this urgency and upset shall we make it. Please try to give me some relevant answer. Thanks a lot. Viktorija