Guessing the age of building:

Most people can easily tell a brand new car from one that is very old. Trying to judge the age of many of the cars in-between is more difficult unless you have paid close attention as the cars came out or you have done some specific study. The same is true for buildings. With a little research most people can usually make a pretty good guess about building dates. After only a little study, it would be clear to most people that this building dates to the late 19th century. 

Question # 2 (a):

But is it possible to guess more exactly when it was built? What sources are there to learn more? And how would you check your guess?

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Who lived here:

This building was almost certainly built as a two-flat, meaning that it was meant to house two families. 

Question # 2 (b):

How would you know that?

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