Looking for some advice on Short Sale

[Jolanta Joxma]

Hello everybody
I need advice on Short Sale.
I’m looking to buy a 4-plex in LA, California and I’m new real estate agent.
This is a little description about the property. This property is 4-plex.1 unit is vacant and 3 units is occupied by long term tenants. They live there 8-15 years and they pay very low rent. This property now collects about $2100/month and market rent is $1200/unit.
In the beginning this property was listed for $389k, I send the offer for $385k.
Agent came back to me for $420k. I send a new offer for $395k and agent got answer $430k. I made a new offer for $400k and ask to deliver property empty and bank email 425k. I haven’t got any counteroffer form, everything was send in email, plain email.
Now I’m getting from listing agent every day call, asking when I’ll submit new offer.
In my real estate office my broker is telling me to accept the offer and then lock property, but I fill the price should be lover. I need advice from experience short sale specialist.
Thank you for your time