In many cities, I am seeing significant quantity of unit construction starting too take place and housing prices rising extensively.

@Jace Peters @Zach HarsinI'm just getting my foot in the door as well. 

Next door property is also a duplex, owned by a retired couple.

It is very well built but what really piqued my interest was the potential to convert the formal dining to a 4th bedroom simply by adding a door. 

Finding buyers is the easy part, securing the contract is what you need to be focused on.If you have good deals, you’ll have investors banging down your door all day long.

... to take.Have a door in a run down condo in a good urban location that got an offer by an investor that now has overwheling majority of building owned.

My house is a 2 story (3/2) upstairs and downstairs 1/.5 + a huge family room and a bunch of closets I will never use.bought in 2009 for 745000 in the SF Bay Area Peninsula4/2.5 everything re-done in 2008zillow/trulia shows $1.4MThere is 1 exit through the garage and 1 private entrance through a side door/side yardI need to install a small kitchen , a shower and move the laundry room into the garage.

More doors the better

If it can bring close to $100 dollars a door and at least 10% cash on cash return.

We did one..we bought the home next door & initially we got $820/mo in a 70's era SFH in very very tired shape.When they moved after 5 years we rehabbed it for $18k & got $1400/mo & that was 6 years ago.We did bump the rents over 2 more tenants (now $1650/mo) but the current tenants do all the maintenance.When the 20 yr old HW tank burst at the seams they shut everything of, cleaned up the mess.