As a novice in this market segment, I have ZERO issues with partnering with a more experienced investor, and giving up a sizable portion of the deal in order to acquire it, and then refinancing them out once I am eligible to do so with the property in our possession.  

On day 1 of possession I went to pick up rent from the 2 remaining tenants.

Buyer will be responsible for obtaining possession of the property upon closing"How does one deal with such situations? 

, change the locks and move on.If they are still in it, you might want to consult an attorney and move forward with an eviction for writ of possession asap. 

State that you have possession and want a 60 hold open to determine money damages. 

Notice to quit.(1) A tenancy may be terminated by notice in writing, served not less than the respective period fixed before the end of the applicable tenancy, as follows:(a) A tenancy for one year or longer, three months;(b) A tenancy of six months or longer but less than a year, one month;(c) A tenancy of one month or longer but less than six months, ten days;(d) A tenancy of one week or longer but less than one month, or a tenancy at will, three days;(e) A tenancy for less than one week, one day.(2) Such notice shall describe the property and the particular time when the tenancy will terminate and shall be signed by the landlord or tenant, the party giving such notice or his agent or attorney.(3) Any person in possession of real property with the assent of the owner is presumed to be a tenant at will until the contrary is shown.(4) No notice to quit shall be necessary from or to a tenant whose term is, by agreement, to end at a time certain. (5) Except as otherwise provided in section 38-33-112, C.R.S., the provisions of subsections (1) and (4) of this section shall not apply to the termination of a residential tenancy during the ninety-day period provided for in said section.

It was under-performing at 65% occupancy prior to possession, and had an NOI of $35k.I was willing to pay a 10% cap rate, so at $35,000 NOI, I would have paid up to $350k.

If you go the Cash for Keys route, get a signed Release of Possession from the vacating tenant.

My goal is to either collect rent or get a Writ of possession within 30 days of the rent being due.

I will gain possession 4/10/19 and I plan to have it rented by June 1st.