A preliminary Team includes Attornies, real estate Agents, CPA's (or accountants), Inspectors, General Contractors, and Handymen.Always remember to do a math analysis and try to look at prospective properties before you make an offer or at least have a clause in the sales contract that allows you the time (about 15 days) to make a detailed inspection and possibly back out of the deal without a penalty that will hurt you very much.  

Strange it hasn't gone thru a tax deed sale.

The rental portion of the duplex will cover my mortgage and upkeep.When I quit my current job I want focus on my small business and also supplement my income by cashing out my 401K and buying another multifamily investment property. 

A home went for sale in June 2016 for $799,000 in San Diego on Island ave.

I've read a few articles describing the benefit of using a 3rd party like "cozy.com" to collect rents from tenants...one benefit being my routing and account number aren't given to tenants for direct deposit which can evidently lead to issues down the road...however, the main benefit being that a tenant can stall an eviction by direct depositing a portion of the rent owed into my account, thereby, nullifying the eviction process and having to start over since I "accepted" partial payment. 

    - Regarding having the tenants sign new/updated leases = The existing leases remain in effect after the sale. 

Basically, its an auction type of sale, the winning bidder has to have funds right then in cashier checks.

The two gentlemen behind the sale of the 535,000 acre Waggoner Ranch in north west Texas (near Vernon) share part of their story at this podcast. https://www.recenter.tamu.edu/news/podcasts/?

Vacancy can be 0-25% depending on turn over and what month they move out.Maintenance depends a bit on age of home but I would use about 0.1% to 0.2% per monthCap Ex depends on traditional (.5% a month) or private money (1%)Sales Expenses:  6-8% for closing and realtor plus about 2-4% for holding costs

I believe that many local realtor association purchase and sale agreement forms include some seller financing terms in their financing sections.