Multifamily property management is quite different than single family, I have done both. 

I am aware of products once I own the property, but what about lines of credit to secure a winning bid? 

Looking for property manager recommendations from other investors.

Can they prove how long it takes to rent a vacant property?

_______________________________________________________________________________Recommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

They can make your property more attractive, help retain tenants, and potentially justify higher rent.

Then the seller gets that exact amount for the property at times (it's a low percentage but it happens).

Are there any Lenders this offer Line of Credit for investment property? 

This number carries over into the two replacement properties.You don't mention capitalized improvements so I have to assume that your adjusted cost basis in the relinquished property is $230k. 

Looking for references for property manager who has experience managing furnished midterm property (30 days minimum stay).Respectfully,Oleksandr