>>>My issue is with the not doing anything that could be considered a conflict of interest.
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>Are you offering IT expertise for a project in which competitive advantage comes from their domain knowledge?

Yes, they are a Real Estate company and the guy who developed an application to run their business can no longer support it so I have been approached to help maintain it and do some add-ons to the system. I know nothing about real estate, but the system looks pretty basic (although the coding looks very convoluted :()