I am wanting to buy an apartment complex.

The question you are asking is looking to oversimplify a very complex and dynamic economic system. 

How would you go about putting a value/offer on a 336 unit apartment complex that is vacant and has been vadilised?

Here is the deal - not sure if it is complex but I will do my best to explain:Property A Purchased at 305k, renovated, rented and retaining: Single family renting at $5000 a month - great cash flow - equity in home is substantial - value of home is over 700k; currently have 1 mortgage on home and owe $220k; have equity line of credit of $150k and have not touched it; Net Annual Return is 44% roughly (probably won't come across anything like this again) Property BPurchased at 450k, renovated rented and retaining: single family renting at $4000 a month - decent cash flow - equity in home has increased due to reno - value now worth near $550k conservatively and have 1 mortgage on home; not really interested in doing to much more with this property at the moment; Net Annual Return is around 10% (put a substantial down payment down to increase cash flow)Property C - Looking at dealing - Buy?

Do companies allow landlords to have a more hands on approach (In the interest of saving the landlord money) by letting the LL manage simpler tasks  (collecting rent, managing repairs) while the Company manages more complex tasks  (tenant screening, evictions, handling other legal stuff )?

Mostly interested in multi-family, buy and holds and recently apartment complexes have triggered my interest.

I did 8, 1b/1b units in a small complex a few years ago as my own personal training program.  1st unit took 3 months of part time labor to complete. 

That is different than a large apartment complex.

Christopher,Commercial Insurance for apartment complexes is not a market that all Insurance companies play in. 

When we put small Apt complexes on the market we typically receive 20 to 30 requests in the first week alone wanting to see the inside.