I found it very hard to find multi properties in areas without severe weather issues (in my identification time) that were in nice enough shape to not have to be rehabbed.

@Rahil Jain, a lot will depend on how you stated things on your identification list that could give your QI the leeway needed. 

Tell them it will be a 1031 exchange and when you expect your identification period will end. 

A new Tenant, for which you have no background, no identification, no visible means of support, and now you need to initiate an eviction.

Sellers don't often know the tax identification number for a parcel (depends on state and property type but called an APN number).

There's a family that is interested but they don't have a social security number, only an individual taxpayer identification number (ITIN) which can be issued regardless of immigration status.

Prior to getting this license, applicants should obtain a Commercial Activity License, Business Tax Account Number, Federal Tax Identification Number or Social Security Number (for individuals), and Zoning Approval (for two or more units).

Shares in a REIT are securities and the laws require that the operator has a document roll of all owners with their identification.

Treat the 45 day period not so much as an "identification period". but more as an "I gotta get this thing under contract" period. 

You may be required to apply for an ITIN(Individual Taxpayer Identification Number).You may be required to file US tax returns in the future.If you sell a property, you may be subject to FIRPTA(Foreign Investment in Real Property Tax Act).Consult a CPA as you progress through your real estate investing.