It's based on a lot of factors, such as amenities offered (i.e. fitness center, clubhouse, swimming pool, etc); costs to operate/maintain common areas (i.e. landscaping, electricity for common light fixtures, gates, repairs to roadways, parking lots, etc); cost of any insurance that's required; size and age of the property and infrastructure; planning for future capex projects for the property; etc.  

Often the third adult is a college age child or elder parent living with the other 2 adults for support, so the cost for the background check ads up.I would like an application where I can edit or change questions. 

Slab, crawlspace or basement and age of water pipes ?

Welcome to the "new age".So look at it differently.  

What's the age of the building?

Given the age and lack of amenities offered at these buildings, $750/month might be more accurate meaning that after complete renovations, this portfolio could gross $13.5k/month and $162k annually. 

It's really in great shape for it's age.

@Hans Morgage Depending on the age of the tiles they my contain asbestos.

They list the age of my house as 129 but it’s 62 years old with an effective age of 15.How much can age improve an appraisal?

I believe I am ready for investing on my own but I understand that my age can stand in the way.