Sometimes you have to respect their old lease until that expires, depending on the state.

@Blake Garcia wait a minute you can start a new lease day one.I was under the assumption that you had to honor the old lease until it ran out.The only option I thought I had was cash for keys or wait until their lease expired.

Then you can renew your policy with them just before it expires to continue coverage for the next year if you feel that they have performed well. 

We see expired listings, so through Appfolio we added the listings for the vacant units to rent.

If they have an acutal lease as you said, it is binding on both of you until it expires in March, however if any clause in the lease is being violated by them, then you have the right to evict now.

(Of course, I'm assuming all the tenants are month-to-month - if they're on leases you'll need to wait until the leases are going to expire.)I also find that tenants are a lot more accepting of rent increases when they see that you improve their units and address any deferred maintenance or outstanding maintenance requests that the previous owner may have neglected.

@Reinaldo Giudici, this property was on the market and it had expired to i reached out to the seller with a letter offering to buy if she was still interested.

Expired MLS listingsHomeowners who tried selling their properties with a local Real Estate agent with no success; this also includes homes currently listed on the MLS for an unusually long time19.

@Benjamin McGuire You can purchase lists with different motivations like absentee owners, 60-90-120 days late on mortgage, pre-foreclosure, delinquent taxes, water cutoff, code violation, evictions, probate, divorce, etc. and mail or cold call.Other methods are driving for dollars, door knocking, wholesalers, craigslist, Realtors, FSBO sites, expired listings, put out bandit signs, billboards, newspapers, other offline publications.You can use pay per click/adwords, motivated seller website with SEO, facebook, Linkedin, Youtube, and other forms of online and social media marketing.If you have a big budget you can do radio, TV and billboards.

The units are already occupied and I would have to wait for leases to expire to do some rehab work to increase the value and raise the rent.