-with the current owner redoing 3 of the 4 units before purchase, I feel like this deal is a no brainer.

The lender that I have been using has informed me that the condo is not Fannie Mae approved due to the fact that one owner owns more than 10% of the units. 

It's an owner occupied rental.

It might be more of a concern in a complex dominated by owner occupants, who would be more likely to push through HOA rate hikes that are less likely to see a net gain for an investor.Your cashflow is entirely based on how much down payment you bring to the table and terms of the loan.

Then look in the county assessors website to find the owners. it should give their name and mailing address.

The owner has paid so far $70,000 on his mortgage(bought the property for $105,000) but due to personal reason he hasn't been able to make last few months mortgages, in total he is $5,000 behind.

I think all you need is a title company to close your transactions - no don't need an account at this time - most title companies have lawyers to close your transactions -You should make sure that you buy real estate at a giant discount - Understand the management process - learn how to be a good landlord - a tenant is a customer - the tenant is the person who will pay for your mortgage - treat them well.Find discounted real estate from landlords who find themselves in rent court -Start to deal directly with owners - I don't think you should depend on agents selling retail properties - you need to go under-ground for great deals -Tax salesPublic AuctionsRun print ads and radio commercialsInternet - 5 weeks ago I created an internet site - I have received over 200 leads - have 70 offers out there and 15 ratified contracts - learn those systems and you will do well.Expired listings - go knock on some of those doors - an expired listing is  FAILURE of property to sell - I am sure the sellers are not happy - go find them and solve their problems.Direct mail to commercial properties owners - commercial buildings can be  great profit center - when you advertise for real estate - signs - internet or mailings always advertise - WANTED REAL ESTATE - houses - commercial and non-conforming properties - all cash -as is - no commission.

Couple A is willing to live in the bottom portion in order to get the better rate and less down since it will be owner occupied.

The current owner had a partnership in it, which dissolved and is why they are selling.

Following are the similarities and differences between the solo 401k and the self-directed IRA.The Self-Directed IRA and Solo 401k Similarities Both were created by congress for individuals to save for retirement;Both may be invested in alternative investments such as real estate, precious metals tax liens, promissory notes, private company shares, and stocks and mutual funds, to name a few;Both allow for Roth contributions;Both are subject to prohibited transaction rules;Both are subject to federal taxes at time of distribution;Both allow for checkbook control for placing alternative investments;Both may be invested in annuities;Both are protected from creditors;Both allow for nondeductible contributions; andBoth are prohibited from investing in assets listed under I.R.C. 408(m).The Self-Directed IRA and Solo 401k DifferencesIn order to open a solo 401k, self-employment, whether on a part-time or full-time basis, is required;To open a self-directed IRA, self-employment income is not required;In order to gain IRA checkbook control over the self-directed IRA funds, a limited liability company (IRA LLC) must be utilized;The solo 401k allows for checkbook control from the onset;The solo 401k allows for personal loan known as a solo 401k loan;It is prohibited to borrow from your IRA;The Solo 401k may be invested in life insurance;The self-directed IRA may not be invested in life insurance;The solo 401k allow for high contribution amounts (for 2016; the solo 401k contribution limit is $53,000, whereas the self-directed IRA contribution limit is $5,500);The solo 401k business owner can serve as trustee of the solo 401k;The self-directed IRA participant/owner may not serve as trustee or custodian of her IRA; instead, a trust company or bank institution is required;When distributions commence from the solo 401k a mandatory 20% of federal taxes must be withheld from each distribution and submitted electronically to the IRS by the 15th of the month following the date of each distribution;Rollovers and/or transfers from IRAs or qualified plans (e.g., former employer 401k) to a solo 401k are not reported on Form 5498, but rather on Form 5500-EZ, but only if the air market value of the solo 401k exceeds $250K as of the end of the plan year (generally 12/31);When funds are rolled over or transferred from an IRA or 401k to a self-directed IRA, the amount deposited into the self-directed IRA is reported on Form 5498 by the receiving self-directed IRA custodian by May of the year following the rollover/transfer.Rollovers (provided the 60 day rollover window is satisfied) from an IRA to a Solo 401k or self-directed IRA are reported on lines 15a and 15b of Form 1040;Pre-tax IRA contributions on reported on line 32 of Form 1040;Pre-tax solo 401k contributions are reported on line 28 of Form 1040;Roth solo 401k funds are subject to RMDs;A Roth 401k may be transferred to a Roth IRA (Note that from a planning perspective, it may be advantageous to transfer Roth Solo 401k funds to a Roth IRA before turning age 70 ½ in order to escape the Roth RMD requirement applicable to Roth 401k contributions including Roth Solo 401k contributions and earnings.)