It sounds like you might be successful in resolving the dispute, but that the dispute itself is causing you to delay the sale. As stated above, this type of dispute cannot delay the sale. But you need to be transparent to prospective buyers. Knowledgeable buyers who understand strata might not be put off, but others might be. A suggestion is to be a legal opinion from a reputable strata lawyer (or from 2) outlining the issue, and how to deal with it, and providing an opinion of the risks involved, (ie, that the gate may need upgrading or repainting etc). Provide that opinion to prospective buyers, and go ahead with the sale.