We also can't use a metric like cap rate and NOI as it is more suitable for more than 4 units.What is the best metric to evaluate such properties?

I constantly point out features to my buyers that will either add or detract from functionality and market value - these are all intelligent people and many are repeat home buyers, but they still find the information very useful. 

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But each house on the same street is in different conditions, sizes, lot sizes and do not have the unique feature of a ginormous house garage.If there is any advice you can provide me I would be quite greatful.

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Great move, first, i would recommend to search what area in the united states have better Cap rates and then i would recommend  to dive in to realtors and get the correct info from them.If this is going to be an investment property that you are far from, i would recommend  to look for a good property management in that same area as well, while you are looking for the investment property. 

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Maybe a 8%-9% cap rate.

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They have 8.5% cap rates still while Massachusetts is closer to 5% and the down payments are more manageable back there.