@Juan De La Garza, there are two factors here: a) what are you expecting out of the sellers financials that will effect value?  

The new mortgage will be larger than your original mortgage since it includes the additional amount you have cashed out.

Another big factor in my search for an agent is someone who has extensive experience in the process of vetting prospective tenants. 

Code for your area may include plumbing, electrical, bedroom windows (proper height, width and clearance for egress), some areas require sheet rock around the heater and hot water heater. 

This process is quite specific and must be adhered to with strict guidelines, including timelines and the nature of the property being purchased.Another method is the lazy 1031 exchange which is banking passive losses on your 8582 FORM from depreciation on other parts of your grouped portfolio such as several other real estate syndications.

Wholesaling in SoCal can be tough....i haven't found the competition factor a set-back yet..if your really out in the streets, knocking on doors, at your court houses, county buildings consistently you find there are not as many wholesalers as you may think actively wholesaling.....there are quiet a bit of people talking and wanting to get in...i use the county buildings and the court houses for my leads...there are some really great untapped resources and tons of different types of leads you can get from those two places...and of course I have not discovered anything brand new...im just realizing the sucess is in the fight and how hard you want it...when i found out about these two sources i started to pull data from them and let me tell you it was overwhelming...but it was a gold mine...before i made enough money to pay someone to do this for me....i had to spend hours and hours and hours daily scrubbing data....finding address and owners names...etc...i have a system now and it runs smooth...i find some really great deals throughout LA County and Riverside County...I have 2 cash buyers that have bought all my deals...thats another important thing find real cash buyers...when i first started out i didnt have real buyers and i found out other wholesalers were acting as cash buyers just passing my deals on and on and it became a daisy chain leading to no where...Anyway i love wholesaling and i could type all day..if you want some creative ideas to find properties PM me....but dont give up...and don't let anyone discourage you about SoCal...its tough and it will literally make you cry....lol but its great place to start wholesaling...if your willing to put in the work...

This takes into account factors like mortgage payments, vacancies, HOA, and so on.

Many investors have full time W2 jobs, myself included.

The issue is, after asking them, my neighbor/tenants will not update their mailing address to include the "1/2", so I am regularly getting their mail and placing it in their mailbox.

Other considerations things to look at include; are any utilities common (like paying for a boiler for all 4 units instead of individual furnaces), how does access/common areas work, do the tenants all have access to laundry, are there any common area utilities (light common area lights, electric or gas for laundry) that would stay in the owner name.