The most straightforward way to increase the value of the real estate is to perform a renovation. The latter may differ in the scope and complexity from a major overhaul, including building materials, pipes, and electric wiring replacement, to a simple repainting or redecoration. The condition of the surrounding area makes a difference too - as such, try to make the backyard look like a place that human wants to spend more time in. In particular, the place should be clean and, ideally, host green vegetation. 

Another advice would be to keep the offer advertisement for a longer period of time, as it increases the chance of a customer with a higher bid to emerge.
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