All the other houses in the neighborhood, this size, are selling for around $250,000. 

I try to find the more profitable building, with 5/6 appartments of different sizes.

Write a strong lease and screen your tenants.

Now, look for houses that have recently sold, same size, etc.

This is a "course" (fairly inexpensive) in Screening Tenants and Tenant/Landlord Law.

There will be no “selling from the stage” just pure unadulterated meaty content that will be broken down into bite size “golden nuggets” that you can apply in your market andDOMINATE!"

I've been stuck with title search fees a few times this summer, so I am refining how I screen deals before sending them to the title company.For example, my last seller bought his property without a title examination.  

I found that Bigger Pockets has lots of tips and advice on tenant screening.  

Both were sitting on the same size several acre lots and were near each other.

Tenants who have been screened properly generally will not destroy your property and will usually give you notice, allowing you to market the property while still occupied, have a new tenant lined up ready to go, and move them in very soon after the prior tenant leaves.