We knew about it.Sale was March 1st...we got the Certificate of Sale at 1:31PM 3/1. 

or since I basically made it into a duplex will it not pass a certificate of occupancy if it's in a single family zone?  

You might consider a certificate of training which may weigh in your favor.

Get Real Estate Brokerage licenseRequires me to have a real estate license for 5 year and practice the last 2 year prior to getting the brokerage license.12/2021-3/2022 Real Estate Licensing FEE(does not include REALTOR Or BROKERAGE FEE) Real Estate Class (Audio books, Extras) 299 Application Fee 89 Fingerprinting 60 Practice Test 20 Test Fee 32 Post Test Class 119 Subtotal 619 GMAT Book 144 Test 250 Subtotal 394 MBA Pre-requisite module 3000 In-state Tuition 16617.24 Online Class Fee 1800 Documentation Fee 100 Subtotal 21517.24 CPA Self-Study Review Course 1300 Apply for 2 section AUD + BEC 536.60 Apply for 2 section FAR + REG 536.60 Reapply For REG (Retake Exam) 271.25 Self-Study ethics exam 125 Initial CPA certificate application 165 Subtotal 2934.45 Summary of fee Excluding Brokerage License Real Estate License 619 GMAT 394 MBA 21517.24 CPA 2934.45 Real Estate Brokerage License ------ Subtotal 25464.69 So this is my plan thus far.

I am leaning towards tal lien certificates and past due tax deeds, Fix and Flip, and Buy and Hold property.  

Therefore, Certificate of OccupancyCertificate of AcceptanceYou should bee consuming much time in preparing your rentals for showingCompletely  move in ready before advertising.Having great curb appeal to the drive by lookersLearning how to place an ad and what words you can say and what ones you can't.You should be consuming Learning forms you need to use and what they are for and where to get them,Notice to Quit (Non Payment of Rent)Summons and ComplaintJudgmentsEscrow FormsWrit of RestitutionNotice of Termination of TenancyNotice to Quit due to Health HazardsYou need to know your states laws in when you can send these forms.You should spend much time in developing a Great Lease AgreementApplication FormsAnd know what words you can say and not say in them as well. 

You will need to get a flood elevation certificate to determine if the 4plex was grandfathered in to a lower rate, if you will need to pay a higher rate, or if the 4plex is above the base flood elevation level.

What should I look for when applying for Real Estate Agent certification courses?

Yep these properties are always offered and some unknowledgeable investor will think they are getting  great deal.A few years ago, my son found one of these tax sales properties that was controlled for years by one investor, he forced the cancelation of the tax certificate and offered the city $30,000 for this commercial property, after a few attempts, the city accepted the offer.The property now is worth over $300,000, it has  two large apartments and a store on the first level.Talk to the right people in the city, present your proposal and they may accept it.Good luck.

I have been to college, BA and MBA, as well as several certificate and certification courses.