Inventory issues when purchasing a 1031 upleg

[Daniel Johnson]

if a client is selling his apartment building and is looking for an upleg, how can he play it safe

In this current situation of low apartment building inventory in Los Angeles,

For examples what tactics can be used to make sure that his property is sold while securing another

That is of his liking 

Examples, an option to delay escrow closing for 30 days, etc

What options are availble?