You will need to supply more detail to your request to figure out which lender might be best for your project.Thanks Steve, Preferably a bank with checking, that will finance multifamily for my LLC, based on the asset and its existing and potential returns not necessarily my credit or income. 

I also make extra payments on existing mortgages. 

So if you buy and rent out a retail center or an apartment building or increase the existing income the property is going to be worth more and can be refinanced easier.

I am thinking about actively trying to grow my investment portfolio and use my existing properties as leverage to acquire more properties.

One great tip I received from Rob Abasolo is to invest more into your existing property to maximize revenue. 

If the owner used a Texas Association of Realtors(TAR) lease, a provision exists for finding a replacement tenant and charges the tenant with a % of one months rentEdit : Fred types faster than me !

They can also be available in existing neighborhoods in infill lots. 

Basing estimates of rents and expenses based on my existing knowledge of local markets.

But they're going to require you to refi the entire amount (i.e. they'll refi the existing loan of 1.2 and add the 200k for rehab for a total loan of 1.4). 

Should I still do some sort of addendum to the existing lease to have it in my name, or am I okay to leave until renewal in January?