It's my understanding that if you apply for pre-approval with several lenders, it's best to have them all perform a hard credit pull within a 2-week span, to avoid it affecting your credit.

Two rules apply:1) The cost of the replacement property must equal or exceed the price of the sold property (less actual selling/closing costs).2) Seller must reinvest All of the cash received from the sale of the property, to totally avoid taxes.  

It is the credit reporting agencies that can lower your credit score by applying too  many times.

What exactly is debt to income ratio , does this only apply to credit ?

Some suggestions: (not sure if this all applies to the RE market in India, but I assume there are similarities)Read Brandon Turner's book on Rental Property Investing https://www.amazon.com/Book-Rental-Property-Investing-Passive-ebook/dp/B018UTI2DOListening to the BP Real Estate podcast https://www.biggerpockets.com/podcastListening to the BP money podcast https://www.biggerpockets.com/moneyshowStart analyzing deals to get practiceEngage more here on the BP forumsPost a profile pic!

Notify each tenant in writing that you intend to increase the rent and require them to apply and meet your standards.

Apply for a credit card and pay it off every month so you don't get charged interest.

We are still weighing my options at the moment but leaning towards having him apply for the rental, agree to the lease (assuming the credit / bg check isnt negative) before closing and if not (if he doesnt agree or the his credit profile is poor) then asking to vacate within 30 days

i originally just wanted 150k loan cash but they told me i should apply for 500k and pay off the other two loans for a better rate with themhttps://www.suntrust.com/loans/equity-line-of-credit

We have often sold them after some rehab for 2x the initial cost so when you apply the 12% note to 2x initial price your return can be very high.