The principals of feasibility are the same irrespective the type and size of your investment. If your prospective investment/development is a land subdivision, construction of industrial units, a row of townhouses or a duplex you need to get some of the principals of investment clear in your mind before commencing.
First, think of how you determine what is a good investment for you (not what you think other investors/developers think or say, this is your project, stay true to your methods).
What you want to find know, straight up,
1. Is tying up your money for extended periods going to be a problem for you and
2. is the return really worth the risk?