Other most common factor: Family Size increases due to marriage or having a child. 

I informed the seller that because of the overlay, the property may be 2 build eligible in-spite its small lot size.

Reality is most of us who make it long term work our butts off in a W2, save as much as possible and build it over time -- When I see people want 10 properties in one year with no money down - I question how realistic that is, of course anything can be done but is that even the right play unless your sitting on $2-$3M in cash?

Go to BUILD YOUR TEAM at the top of the screen and look for local investors or meetups in your area.

I informed the seller that because of the overlay, the property may be 2 build eligible in-spite its small lot size.

I am just starting to focus on building our portfolio and growing it hopefully successfully the next 7 years. appreciate the insight, Scott. 

For new builds and some rehabs they are vented but in some conversions or apartment remodels I will opt for the ventless units.

You're better off focusing on specific markets, specific neighborhoods, analyzing numbers, and building an ideal buy [box].

Quote from @Victor Yang: Hello all,I am looking to buy an apartment building.

What factors should I consider when making this decision?