The cost of missed opportunities.Where do you stand between living for free house-hacking in the suburbs (a house with three roommates), as opposed to 'losing' $1000/mo house-hacking a duplex in the city center (no roommates), and being closer to all the opportunities for social and professional networking that now become a lot more accessible and frequent?

Get driver's license and Social Security Card copies.

The younger sister who is in college will also move in.The issue is that the parents do not have Social Security numbers but they do have an Individual Tax Identification Number (ITIN).

I generate my own business and in the process get to post about it and building social credibility which in turn has brought in business from my network. 

As I have been looking over my books, I am finding that I spent approximately $500,000 last year just on interest, lender fees, etc. for those properties  I have been thinking about posting on my social media accounts, such as Facebook and LinkedIn, seeing if there are any private individuals who have cash sitting in money market or bank accounts, who might be willing to become private money lenders for me. 

You should also list the things they should transfer to you: security deposits or any other funds held on your behalf, spare keys/codes/openers, tenant contact information, tenant payment history, information on any unfinished maintenance requests, etc.NOTE: the PM may refuse to share the application because there is a legitimate, legal responsibility to protect sensitive information the social security number.

I go to occasional social meetups mostly to try to give newbies some things to ponder.  

Seller was happy, I was happy and we all got what we wanted, seller even gave a testimonial on my social media account. 

@Nathan G. gave you an obvious example out of his own portfolio of a high-maintenance building, but you can get a lot of surprises in single-family, in duplexes, in nice neighborhoods, with all kinds of tenants from all kinds of social backgrounds, despite the best vetting you can put in place.

My name is Yang, I have a degree in the social sciences but have always been interested in personal finance and investing.